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101Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Mar 16, 2012 12:13 pm

Inge K.


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@charlie99 wrote:better feed those little grey cells with some more alcahol, im starting to make sence .bounce
Hey.......it`s weekend........soon all things would make sence.

Inge K.

    

102Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon Apr 09, 2012 10:53 am

weeble

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Hi Guest. I am new to K100's and posts like yours are brilliant. I very much like your late evening light shot you posted Sat Oct 08, 2011 9:26 am.
I know this is off topic but, can you please tell me what seat that is, as it looks a bit lower and more stream lined than my standard "seat bench".
I am a bit on the short side and your seat looks like it might be the answer! Your info would great!

Thank you.

    

103Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon Apr 09, 2012 11:42 pm

JR_K100RS

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G'day Weeble , I'm pretty sure the seat is a Corbin ( Canyon Dual Sport ) , I've got the same on my bike , not sure if it's going to help you get a better foot hold , the seat is much wider than stock so it tends to cut in on the back of your leg when you put your foot down having said that it's great on the move .

JR

Melbourne Australia


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

104Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 12:44 am

Two Wheels Better

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I've just noticed this post...pardon, the forum didn't 'inform' me via email since I probably didn't follow up on a few posts previously.

It is a Corbin Canyon Dual Sport in leather, very hard, but comfortable over the road on long and short trips, but too 'tall' for me in that it doesn't allow me to slide all the way back...ideal for a 6+ footer but not a 5' 9" soul. I get my feet to the ground flat, though it has a slight rise to it where the legs would naturally fall, but otherwise no worries. I wouldn't buy a Corbin unless I went to Hollister, California and had them make it to my preferences.

I've now got abut 17,000 kilometres on those tyres and wheels from last October and they're just now wearing flat in the back and mildly 'scalloping' in the front - a reflection more on the sharp camber of our roads than the tyre's design.

This weekend I removed the 2mm spacer to allow the tyre to sit closer to the swingarm. I filed off an area 1.5mm deep and about 30mm long of the reinforcement rib on the inside of the swingarm to allow the tyre to clear better and to give it less of an offset - not a handling issue but someone commented on it being off to one side so I thought I'd see what I could do to rectify it. Shifting the tyre to the right a few mm more changed nothing as far as roadholding or cornering goes.

Next stop, Conti's new Road Attack 2, with rubber that's 'cured' using different heat levels from centre to edge, gradually getting softer for handling. Not a true dual compound, but a similar result. I got them cheap from the area rep. If they suck there's always my new favourites, Pirelli Angel ST...


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

105Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 4:03 am

K75cster

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(mildly 'scalloping' in the front ) isnt that a sign of an under inflated trye? I know the significance of the wheel/tyre changes brought upon your bike but doesn't it indicate that maybe you can go up a couple of pounds in the front tyre?


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

106Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 5:03 am

Two Wheels Better

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38psi minimum front on up to 42psi when heat, speed and/or load are a factor. Bad scalloping is a sign of underinflation. I use a tyre pressure gauge regularly.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

107Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 5:25 am

K75cster

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38 - 42 is higher than I was expecting, so its not underinflated that's for sure.A late braker perhaps???? I usually ride in the r/h wheel track which is normally worn on the roads I used so the camber didnt effect me that much but late braking did for two sets of tyres, then I picked up on that very thread and started to brake earlier and from then on tyre life went up me33's for 18thou or there abouts


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

108Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 7:29 am

JR_K100RS

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Yup , agree totally with G I T H ( about the corbin ) I'm south of 5' 9" and I find that my bum is way forward as well so I'm not taking advantage of the corbin shape as much , I'm due for a seat re-cover & as such have decided to re-do the original seat and move the corbin along , interesting that you filed off some of the rib on the monolever , I was thinking of doing the same , do you still need to take some off the left foot of the centre stand ?

JR

Melbourne Australia


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

109Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 9:30 am

RicK G

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Keep me in mind if you do sell please.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

110Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 11:33 am

weeble

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Thank you JR_K100RS and Guest in the House for the info re that seat. At 5'5" I don't think thats the seat for me.

I have taken a carving knife to my standard "bench seat" and lowered it about 25 to 30mm. Feels much better and lower centre of gravity seems to help handling too.

The only problem is the finish to the seat is a bit rough. Never tried it before. I'll live with it 'till I can find that rare BM Sliding Seat.

Anyone got one, please?

1990, K100RS, 16v. As pictured left (my avatar).

    

111Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Apr 10, 2012 8:09 pm

Two Wheels Better

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@JR_K100RS wrote:interesting that you filed off some of the rib on the monolever , I was thinking of doing the same , do you still need to take some off the left foot of the centre stand ?
JR
Melbourne Australia

In a word, yes, and if you have a look back at this post you'll see that is just what I had to do - just off the inside of the left foot. But the other day I had an idea (watch out!) and added 5mm spacers to each of the four bolts under the centre stand's mounts against the gearbox and the stand is now a few more mm's away from the tyre - I reckon I'm gunna go up to 10mm as it's not hard to hoist 'er up on the stand. Filing away a few mm's from the rib on the swingarm wasn't necessary for tyre clearance really, and didn't or wouldn't weaken anything, but I like a bit of extra space in all things.

The Supertrapp and (RJTRucker's) headers are my next project.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

112Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Apr 27, 2012 9:16 am

charlie99

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akin to twbs plan i have sought and found the k1 rear wheel...way off in blighty.(thanks emylin)

a k1100 /late series k100 center stand was located a good deal closer to homme ...in stanthorpe ...(thanks rick ) and dully modified by our friend caferacer 62 ..(cheers, fantastic welding and help bert )

today marks its application to "gerty"

new and old shots





centre stand modification to acheive clearance



the staintune allowed lots of room for the wheel ...but the caliper on the rear prevented a good fitt ...





remove the caliper and she slotted in fine ....



caliper refitted up before attaching the wheel to the bevelbox was neccesary



the staintune allowed good clearance on the left



2mm spacer on the right between bevelbox and wheel allowed adequate clearance to the swingarm



standard off set for the center stand allowed good clearance to the right side ...never really an issue







the left side centre stand mods just cleared the tyre ......i might grind off another 2mm on the foot though ..clearance ..but only just









the look from the rear

</A>"

and the look from the side



road testing tommorrow

with thanks to all the friends with help and suport



Last edited by charlie99 on Sat Apr 28, 2012 3:59 am; edited 1 time in total


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

113Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Apr 27, 2012 9:30 am

Oldgoat

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Thanks for taking the time to document this properly mate! Cleared up a lot of the misinformation that is out there with this conversion. Bike is looking fantastic!

OG

    

114Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Apr 27, 2012 8:48 pm

Two Wheels Better

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Whilst riding in to work this AM under heavy rain and very leaden skies, I was wondering if Charlie jumped on ol' Gerty and test rode his new back sneaker. There's standing water everywhere and plenty of puddles to jump into. Oh, the joy of a boy with a new toy!


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

115Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Apr 27, 2012 8:58 pm

88

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As GiTH said to me when I got my new pirelli's..."Take it easy on those new skins" Charlie, especially if it's raining. Looking forward to hearing the reports of the roadtest.

88


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88....May contain nuts!

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

116Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat Apr 28, 2012 1:58 am

Two Wheels Better

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Chazza wuz jest here at work showing his new large rear tyre round the place after a wet morning splash over Mt Tamborine. The Cheshire Cat grin stayed on his face for the duration. It looks (and does) the biz. We snapped a photo of the two phat tyred girls, his and mine, framed by palmtrees in the warm Queensland rain...(which he might post before I get to it).

"Phat tyred girls you make the rockin world go round!"


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

117Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat Apr 28, 2012 2:34 am

charlie99

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heres the report ...............

"astounding "

thats it ...nothing more, nothing less

if you have the oportunity......... DO THIS MOD........ you won't be disapointed ....and you will never go back



the two phat tyred ladies



i have to thank gith for documenting the mod before me ...

it has made the whole excersize a straight forward process, given that we had the information at hand

with known issues and preventative action being planned , it has all come together rather nicely .

thanks


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

118Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat Apr 28, 2012 4:29 am

caferacer62

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Looking great Charlie, must feel better with that new rear tyre on. Job well done mate.

Now just have to get me some rims Surprised


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Bert 2.0

Don't give in to the Black Dog!
"A Zorst, a zorst my kingdom for a Zorst"

    

119Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 4:35 am

K75cster

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thats real inspirational work there charlie. beautiful. i notice the rear 160 is smaller than the 130, dropin from 90% to 55% you wont pick it up on the gauges but maybe via satnav, how muck speed do you reccon you lost, maybe 2, or 3 clicks at the posted speed?????Not being nasty, just thinking. If your speedo ran you proud before it might run you clean now?? You know 2 or 3 kays under what you did before.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

120Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 4:49 am

charlie99

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yeah i thought the same k75

i have measured the outside circumference of the old shinko being 2090 mm, maybe about 2100 when it had tread

the new fella measures about 2050 mm which isnt that much different , i guess about 2 percent difference , but still significnt as you say .i could put the sums into the calculator for the speedo calibrator software " karumba " and adjust the speed reading , but im happy that its remeberable at least ...well for the moment .

but your right the difference looks to be much bigger.....i was surprised .

i guess to get another perspective it might be advantageous to ask "what is your current rear wheels circumference and tyre dimensions " and get a better view of results ?

maybe i should ask this in a new post ? whatcha recon ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

121Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 4:56 am

Albyalbatross1

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Nice!!! Hope you had a good day out Charlie!! I am guessing the brief sunshine we had out here was your grin going over mt Glorius:D

    

122Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 5:01 am

charlie99

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yeah i had it planned alby ...but went down to berts place to see if i could help out ....missed him ..he must have been out riding as well .....maybe next weekend .. fernvale pies are ok on the return trip ....grin


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

123Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 5:46 am

Two Wheels Better

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When I did my tyre upgrade I'd been using a 140/80- and went to the 160/60-. The previous tyre size had been calculated and the speedo dashpot inside the instruments adjusted previously using Karamba. So I whacked Karamba onto the new set up and was surprised to hardly notice a difference at any given speed, to barely rate a mention. 100 km/h indicated was 4,000 rpm. Now it's a needle's width different. So I didn't bother adjusting it. No speed camera citations or radar awards have come way my thus far in the nine or so months and 18,000 kilometres I've covered - a safety margin of error. It ain't out as much as one would think.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

124Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 6:05 am

charlie99

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hmm mine must be out ...at 100 i get about 4100 -4150 round about on the old wheel ...thats at the guages ....not real speed ..i recon i better have a look deeper into that ...the revs should be correct ...so the speedo would be out for sure .... im getting lost now


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

125Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 7:15 am

Two Wheels Better

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@charlie99 wrote:hmm mine must be out ...at 100 i get about 4100 -4150 round about on the old wheel ...thats at the guages ....not real speed ..i recon i better have a look deeper into that ...the revs should be correct ...so the speedo would be out for sure .... im getting lost now

Chazzmeister,
remember to factor in that the RT/LT have a numerically higher final drive ratio than an RS so my bike is gunna rev lower at any given speed than yours.



Last edited by Guest in the House on Sun Apr 29, 2012 7:37 am; edited 1 time in total


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

126Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun Apr 29, 2012 7:34 am

charlie99

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lol !! yeah new that ....must have been a brain ..hickup on the way back from the fridge ...yep them rear end gear ratios i guess ...giggles


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

127Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat May 05, 2012 2:18 am

Two Wheels Better

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I've whacked the new Continental Road Attack II multi-compound radials onto my bike, along with a new rear Grimeca brake disc and Icer pads from the Boys at the 'Bins. In an hour or so when the motorbike workshop closes I will roll out onto the motorway and take a 70 kilometre spin towards my weekend home to see how they feel. The rear tyre isn't as wide at the edge as the Pirelli Angel ST, so there's a few more mm's of clearance at the swingarm and the exhaust side has more than a thin fingers' worth of clearance too.

In the can't-leave-well-enough-alone department, I've just whizzed the old, worn tyre off a 17" front three spoke wheel from a K1100RS so I can run the larger 305mm floating discs and a 120/70ZR17 tyre...imagine the tyre choices then!

A full road test will follow tomorrow from places with joyous names and equally joyous road surfaces like Mt Glorious, Mt Mee and Mt Nebo, near Brisbane and the foothills. The weather's looking good (mid-20s, no wind and sunny!). Pictures and observations tomorrow. Full moon tomorrow night too.
Cheers.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

128Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat May 05, 2012 2:37 am

charlie99

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snuck a pic of two of the new rubber

looks like lots grip is there ....and the finish of the tyre is like shark skin ....is that pre run in ?

a lot differet from the shiny cases of all the tyres i have seen before

nice one gith !!!


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

129Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat May 05, 2012 7:25 am

Two Wheels Better

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My first impression of the new tyres came to me because of the several small local neighbourhood roundabouts I must traverse before entering a major road then the motorway. I'm leaning this way and that, slowing, stopping, accelerating, then leaning again. I noticed how light it felt with the new tyres, how the steering didn't feel stable, almost tracking in a 'skittish' manner, not planted like the Pirellis felt. It took me only a nanosecond to remember that the back Pirelli has flattened off considerably over 18000 kilometres, and I had got used to it riding every single day. These new Contis twitched and squirmed and were not confidence inspiring. So I gave it some stick and hit the motorway's heavy weekend arvo traffic towards the city and settled into a 110-120 kph thrum. In twenty or so kms I forgot about it. Changing lanes became a no brainer, a quick turn of the head, a flash or two of the indicator, a mere thought of being in the next lane, and I was. Cool! I can get used to this feeling.

The new Continentals have this skin on them from new that they're marketing as 'Black Chili' and it's supposed to be a non-skid coating that wears off as the tyres accumulate a hunnerd or so kms. You know that greasy feeling you get on a brand new set of sneakers!? On the Contis it isn't there, as their marketing geniuses suggest, or so we imagine. It's what Charlie referred to as feeling like shark skin. Could be snake oil. It's all the same. Too early to say if it's all you beaut.

Pictures and a ride report from the twisties, tomorrow.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

130Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat May 05, 2012 9:17 am

K75cster

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Charlie sorry to be so late with a reply, but the handbrake had an idea, and I've just spent the last week on my hands and knees laying slate. checked the rear 130 90 Me88 with 800 km on it and its 2095mm so thats 45mm per revolution difference. My best guess is 100kph divided by 2095 times 2.81 times1.67 divided by 60mins =3733rpm or for the new trye it would be 100kph div by 2050 times the diff 2.81 times 5th 1.67 div 60mins = 3815rpm the difference 82rpm so less than 1% maybe, bugger all. still its the little things that count when we;re figurin stuff out. Still not sure why it reads 4100 at 100kph. as you say which one is out the speedo or the tacho. Dont ya just love it when we do this. Keith


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

131Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat May 05, 2012 9:35 am

charlie99

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um ...shouldnt the diff be 2.91 for the rt .....2.81 is for the rs ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

132Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun May 06, 2012 3:56 am

Two Wheels Better

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Chazza and I rode out to the hills to do some seat-of-the-pants testing of the new tyres in their preferred environment: twisty roads. I still felt that mild wander so we stopped at the local BP servo to air the tyres up a bit from their initial installation setting of 35 psi front and 39 psi rear - lower than I usually run them. I pumped the front up to 40 psi, the rear to 42 psi. That immediately settled them into a groove. I prefer a harder tyre and firm suspension settings. I like the feedback it gives me.

The Contis definitely feel lighter in the front than the Pirellis. It took me a little while today to get used to it. The back tyre has settled in, I felt pretty good with it straight away, and the barely 5mm-wide chicken strips left are testament to how well it tipped in. Overall the bike is more stable, tracks well, and tips in smoothly. I will have to get used to the easier steering. But I like the feel it has. The roads we rode are fairly smooth surfaces that undulate and climb, lots of decreasing radius turns, mostly 60 - 80 kph limits with a few 100 kph straights. An ideal place to get a tyre to its edge, to test its (and the riders') limits.

Now let's see if we can get 18000 kms out of the Continental Road Attack II's rear multi-compound rubber formula, as we did on the Pirelli Angel ST.

A late Autumn tour down to Victoria to see my Mum in a coupla weeks' time will highlight their potential longevity.

Did I mention the weather was brilliant!? It got up to about 25c and did I see any clouds in the blue sky?



Last edited by Guest in the House on Mon May 07, 2012 9:01 pm; edited 1 time in total


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

133Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun May 06, 2012 6:29 am

K75cster

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charlie yep 2.91 is right I knew that, but I never let the facts get in the way of what I'm thinking. so 2.91 from a 2050 tyre is 3950rpm. Well never mind 2050 verses 2095 is only 10 1/4 metres over the 100 clicks if it was a bike race it would be 4 bike lengths. If the cops arnt lookin then its a bike race right.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

134Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sun May 06, 2012 6:41 am

charlie99

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oh yeah did a little of that today...was surprised there wasnt any "civilian looking chase vehicles" around


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

135Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon May 07, 2012 1:15 pm

charlie99

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chicken strips are getting closer to the edge


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

136Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon May 07, 2012 5:00 pm

88

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Crikey Charlie - were you getting the knee down?

88


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88....May contain nuts!

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

137Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon May 07, 2012 9:11 pm

Two Wheels Better

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After this weekend's spirited riding with Charlie and the usual Tuesday morning commute to work I can say that I still find the Contis not as straight-line stable nor as planted as the Pirellis, but am really enjoying the light steering feel. It's like what a shorter wheelbase motorbike feels like, the Mighty K being a bit of a large barge in that regard. They roll smoothly, due in part to careful balancing on the high speed spinner. Lane changes on the motorway, roundabouts, suburban streets and country roads, all feel better under me now. I've not got a picture for proof like Charlie but the chook strips on the back tyre are narrow and hero-like. I am glad to have the chance to try them but there's a spare pair of Pirellis waiting in the garage for when these Contis wear out, or if the winds change direction.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

138Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu May 10, 2012 12:24 am

K75cster

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Gith great stuff you say when the contis wear out any guess on a kilometre figure for that event???? such grip must come via distance yes????


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

139Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu May 10, 2012 12:32 am

Two Wheels Better

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I got 18000 kms out of the back Pirelli before it flattened off to the point of feeling a bit heavy in turns during the transition to lean, but the front looked good for another 3 - 4000 kms. The Contis are advertised as having a cured compound that goes from a harder centre to a softer edge, but without the hidden 'seam' in the rubber compound common on many other brands. As for mileage, all I can say is we shall see. This morning's commute was a quick dash through many decent curves and me likey the way they handle!


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

140Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed May 15, 2013 5:04 am

charlie99

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interesting to note on our "neranderra trip" the differences between the same 5 inch rear wheel (160mm tyre) and the "paralever" rear end on halo's 86 rs compared to the standard 8 valve rear end ...it lines up beutifully front to rear ....despite all the "educated guesses" that we have seen in the forum

onya halo ...another one solved

just an update to this thread to clarify some of the differences that one can expect when fitting up some radials on large rims to "the old girls "


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

141Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Dec 04, 2013 8:48 pm

JR_K100RS

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Well it looks like there are now 3 phat tyred ladies , I've finally completed the upgrade after the old rear Avon Azaro killed itself ( delaminated tread ) . Following TWB'sexperience & directions I shaved the rib on the monolever , removed the 2mm wheel spacer & also modified the left foot of the K1100 centre stand , the stand mod included grinding the inside edge off , welding up the hole , increasing theleft foot on the outside by the same amount I took off on the inside , all in all pretty easy to do , I've decided to go with Michelin Road Pilot 3's front & rear , 110/80/18 front & 160/60/18 rear , clearance wise , plenty of room to the exhaust , >15mm , tyre to monolever approx 4mm , tyre to left foot of centre stand with bike off centre stand but no rider is approx 6mm , with rider this gap increases .
1st ride this morning coming to work was pretty good considering the greasy tyres , tip in left & right is very neutral , ride is very smooth , gearing appears to be slighty taller ie revs are a little less at 100kmh

Many thanks to TWB for showing the way & Charlie for chiming in as well

a few pics

shaved rib

modified left stand foot


rear view



side view


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

142Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Dec 04, 2013 9:11 pm

charlie99

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its a lot of tyre eh ?

good work mate


just a note

if using panieers on rails as standard ...the tyre may rub on the inner part of the lhs panieer near the rear ..(frame droop whilst loaded ?)


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

143Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Dec 04, 2013 9:31 pm

JR_K100RS

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Thanks Charlie , I did have paniers , sold them a dozen year ago in a weak moment , regret it now , thinking about a set of City cases like yours , got to let the Minister of War & Finance settle down after the last spend first though

Thanks for your input on the project , it gave me the confidence to commit the spend

JR


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

144Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Dec 05, 2013 12:24 pm

AJ.Valente

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JR, I'm in the process of the 3-spoke mod on my 85RT, although using the narrower rim in the rear. I'll be using a Supertrap tuned exhaust and muffler, and can't tell just yet what the final solution will be.

It's not clear to how your stand(s) rest whilst in motion as the pictures are all with the bike on the center stand. Looks like a Staytune muffler (and I can't tell if the headers are stock).

Seems we have now three (3) methods of modification, yours, Charlie's, and TWB.

Although its not entirely clear as to why, on Big Red it appears the stand(s) rest at a lower angle while in motion to avoid the tire entirely, thus obviating any need for modifications to the center stand (am I right?). Meanwhile, you and Charlie seem to prefer the stand(s) rest more in the stock configuration, that is, at a higher angle.


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'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

145Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Dec 05, 2013 3:30 pm

JR_K100RS

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G'day AJ.Valente , if you intend to use the three spoke 3.0x17 inch rear with a 140/80/17 tyre you will have not have to clearance the centre stand , you will be able to use the stock K100 stand , if you take a look at my avatar ( there is a bigger picture of my bike in the picture gallery ) you can see the old 3.0 inch rear rim in use with the stock stand , I've got a Staintune exhaust with stock headers ( same as Charlie ) . As far as K1100 centre stands go mine is modified following TWB's advice ( grinding off the inside left foot & welding up the resultant hole ) Charlie's stand was more involved , perhaps TWB's sits lower to clear his fatter Motad exhaust

hope this helps you

JR


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

146Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Dec 05, 2013 3:51 pm

MikeP

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JR, your bike looks very nice indeed. It just needs an RS belly-pan and it will be a stunner.


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1992 K1
1993 K1100R (used to be an LT)
    

147Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Dec 05, 2013 5:25 pm

JR_K100RS

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Thanks Mike , coming from you that means a lot to me , did you notice the shiny diff filler plug ? , thanks for your help with part numbers

Ta

JR


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

148Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Dec 05, 2013 9:56 pm

AJ.Valente

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@JR_K100RS wrote:. . . if you intend to use the three spoke 3.0x17 inch rear with a 140/80/17 tyre . . . you will be able to use the stock K100 stand , if you take a look at . . . a bigger picture of my bike in the picture gallery . . . )
Thanks for the picture, it makes it clear.

I've already changed-over to the K1100 stand, which I like better than the old.

So, my goal is to upgrade the bike with radial tires, and for those reading this, it wasn't clear at first if the newer stand was required.

My next step is to install the custom exhaust, and that gets tricky because I cannot use the stock bracket that holds the center stand at rest when the bike is in motion. Fortunately, I've done bracket design in my former career, so this should be interesting and fun.

Have a great summer's ride there down-under.

-aj


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'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

149Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Dec 10, 2013 4:33 pm

Two Wheels Better

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I've finally had a chance to have a squiz at your postings to this thread, JR, and have to say that the mods we've done look really good, but especially on your bike. I like the silver wheels on your bike. I didn't bother re-painting my stands after the mods. You've done a bonzer job! I can't wait to get my hands on my Mighty K again. She's tucked up in a shed in Queensland for the next year. Maybe if I stay here I'll ship her over. One can never have too many motorbikes to choose from in the garage.

I've got Michelin Pilot Road IIIs on my R1150RT and can confirm that they are the best wet weather tyre I have ever ridden on. I'm up to over 16,000 MILES on the front and plenty of tread to go! The back lasted about 10,500 miles. I might use them on the K at some stage. Am currently using Conti Road Attack IIs on the K.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

150Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Tue Dec 10, 2013 7:01 pm

JR_K100RS

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Thanks TWB , a big thank you for leading the way and finding all of the solutions to the road blocks , all I did was to follow your road map

Ta Mate

good to hear you have kept the K , stay warm !

JR


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Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

151Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat Oct 11, 2014 11:49 pm

charlie99

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just thought to post again after the wide wheels and tyres experience

a few folks have been amazed that the old bevel drive ( with the 4.5 inch rear rim ) and the some what 14 mm offset ( to the left ) would surely recentre the running line on the tyre , and that they would fall into corners better one way than another .

having at last worn through to the "canvas " I can say that no such thing occurs ....they run amazingly well for the setup ...although you will notice a slight difference when changing over .

some pics of the belts exposed and a ruler to get some perspective (although a little off centre, sorry guys )



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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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