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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 )  


    

152Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon Oct 13, 2014 12:58 am

JR_K100RS

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Jeez Charlie ! , talk about getting max bang for your buck , X2 on your comments , with my Michy PR3's the chicken strips are the same width both sides front & rear , tracks great , tip in is even left & right , a must do mod

JR


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

153Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Mon Oct 13, 2014 2:32 am

Two Wheels Better

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It seems to be catching on. I too have enjoyed using the wider wheels and phat tyres on my early K. I'd do the mod on any K I own from now on. This the 2nd back tyre, a Conti Road Attack II this time after first wearing out a Pirelli Angel ST, I've worn out on the bike now.


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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.
    

154Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:07 pm

mynameisrodney

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Hi guys, sorry for digging up an old thread.

I have just bought a 1986 K100 RS and plan on swapping the wheels so I can go with radial tyres. There is a guy near me wrecking a 1989 K100 RS ABS with the 3 spoke wheels from the info I found here

http://www.largiader.com/parts/wheels.html


The wheels on this should be 17x3.5 for the front and 18x4.5 for the rear. So the rear is the same as what is mentioned in this thread, but the front is different. So I was wondering why it is that people are opting to go for the 18” front instead of the 17” which seems to be easier to come by? The first post mentions that the front brakes had already been upgraded, so was that part of the reason? And with stock brakes on my bike the 17” front is ok?

Thanks in advance for your help.

Cheers,
Chris

    

155Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:22 pm

JR_K100RS

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G'day Chris , my reasoning to do the mod was to mainly upgrade the rear rim ( to 4.5x18 from 2.75x17 ) so that I can use a radial tyre size of 160/60/18 , after trying many many tyres over the years of owning my 1987 K100RS I was finding that there were fewer good options remaining . The front rim on my machine is a 2.5x18 ( standard size for a K100 ) there are plenty of radial tyres available that will fit this rim , in my case I've opted for a 110/80/18 . I'm running Michelin Pilot Road 3's which are fantastic , so in short you don't really need to replace your front rim to fit a radial but the rear yes

Hope this helps

John RE


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

156Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:31 pm

mynameisrodney

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Hi John,

Thanks for the info. So you are running a Y spoke front rim and a 3 spoke rear? I think I would like to have the same style of wheel, although it doesn't really bother me which style that is.

Cheers,
Chris

    

157Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:41 pm

JR_K100RS

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No Chris , after searching for 2-3 years for a 3 spoke front ( 2.5x18 sometimes found on K75's ) I bit the bullet and bought one brand new , don't ask how much that cost me ! , prior to doing the upgrade on the rear I was running a 3 spoke 3.00x17 ( from a K100LT I think )

John Re


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

158Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:42 pm

Two Wheels Better

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If you can locate an 18" three spoke as shown in my avatar below, and fit the 18" rear, as I have done,you'll not have to get callipers, discs, etc, from a Marzocchi fork to fit the 17" wheel. Or just buy an entire 16V front end, but then you'll need, arguably, the Paralever final drive, swingarm and gearbox. How do you spell canoworms?


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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.
    

159Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Oct 19, 2016 10:47 pm

JR_K100RS

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G'day Chris , if you look in the Gallery for "JR's thing" that was my bike before the rear wheel mod , you can see the 2.5x18 front & 3.0x17 rear ( three spoke )

John Re


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

160Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Oct 20, 2016 12:03 am

mynameisrodney

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thanks guys,

So to get this right, to use the 17" front you need to change brakes etc, 18" is a straight swap with stock brakes? Sorry I'm a bit lost, Marzocchi hasn't been mentioned in this thread until now. Buying a new wheel is what I'm trying to avoid.

In terms of using a complete 16V front end, why would changing this effect the gbox, final drive, swingarm etc?

Cheers,
Chris

    

161Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Oct 20, 2016 12:10 am

JR_K100RS

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yes if you find a 3 spoke 18 inch front that will go straight in with your current brakes , if you use a 17 inch front your discs will not bolt up , if you change the discs you will then need the 4 pot calipers , I think if you use a 17 inch front wheel you will be changing rake/trail/wheelbase hence the need for the rear components , others will chime in here

John Re


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

162Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Oct 20, 2016 3:31 am

mynameisrodney

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Ah ok. I hadn't paid too much attention to the profile of the tyres, there's a bigger change in rolling diameter than I expected. So best bet then is grab an easier to find 18x4.5 3 spoke rear and run PR3s on mixed wheels until I can find a 3 spoke 18" front (or give up and throw my wallet at a BMW shop). I've been riding with PR3s on my FZ6 and have always been happy with them.

Thanks heaps for the help.

    

163Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Jul 12, 2017 4:25 pm

boostd4

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Sorry for digging up an old thread. 

I've searched for days getting a definitive answer for what model years a wider rear wheel can be sourced for my 1985 K100RS (that currently has the stock 17" Y-spoke wheel with 130mm tire).

Is the correct bike a 1988-1993 (K589) K100RS?  Realoem.com lists the wheel to be a 3-spoke 4.5x18" wheel.

Is that right?

    

164Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Jul 12, 2017 4:38 pm

duck

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@boostd4 wrote:Sorry for digging up an old thread. 

I've searched for days getting a definitive answer for what model years a wider rear wheel can be sourced for my 1985 K100RS (that currently has the stock 17" Y-spoke wheel with 130mm tire).

Is the correct bike a 1988-1993 (K589) K100RS?  Realoem.com lists the wheel to be a 3-spoke 4.5x18" wheel.

Is that right?

No. 

88-93 K589 is a 4V K100RS that has a paralever final drive.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

165Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Jul 12, 2017 4:57 pm

boostd4

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Right.  So that wheel won't fit on a monolever 4v like mine?  Is there a known model that's wider and fits?

In my searching I came across a post of someone that said the 5-spoke 5" wide 17" wheel from a newer K bike fit on a 4V early K with nothing but some shims.  Anyone know of any truth to this?

    

166Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Jul 12, 2017 6:10 pm

BobT

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Your bike is a 1985 so is an 8 valve (2v per cylinder) engine. The post 1989 RS were 16 valve (4v per cylinder) engines but has many suspension and wheel/brake differences too. I have a spare 4.5" x 18" wheel here from my 16 valve but it is not a straight swap on your bike because of the paralever rear suspension on a 16v.

    

167Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Wed Jul 12, 2017 9:28 pm

boostd4

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Thanks for the response. Total brain fart about the valves, im familiar with my two valve, I'm not sure why I typed four valve. I'll have to dig up the link, but there is a split five spoked wheel from a newer K bike that might be a paralever bike, that someone says fit with just spacers and no other mods on an early K bike that was mono lever. 

Here, it's this thread, the last post where he says he saw it while camping...

http://www.k100-forum.com/t8186-has-anyone-fitted-a-wheel-wider-than-4-5


I'm only interested in the rear wheel for now, I know the front is much more complicated. 

    

168Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 2:12 am

k-rider

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hi 
i have a 4.5*18 three spoke on my 83' 8 valve rs, 
it fits right in , no shim between the rear drive and the wheel(edit you also need a centerstand for a later model, as TWB describes in this thread ) 
only thing is that it it is offset about 12 mm to the left , this is not a problem , i cant feel any difference between left or right turns , the reason for me to do this mod , was partially cosmetic , but mostly to enhance the handling, that IMO is so much better than with the original bias tyre . 

k-rider


169Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 9:36 am

boostd4

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That is excellent info, the important part the thread needs is what model and years exactly, did that 18x4.5" 3-spoke wheel come from?

    

170Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 9:59 am

Laitch

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@boostd4 wrote:That is excellent info, the important part the thread needs is what model and years exactly, did that 18x4.5" 3-spoke wheel come from?
It shows up for the first time on the 1989 K1 model then on the 1990–1992 K100RS paralever drive models. Take a look here.


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1995 K75T 68,000 miles
    

171Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 10:19 am

boostd4

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So does that mean that monolever or paralever does not matter for retrofitting this wheel on to an earlier bike?  

On the paralever bikes, the wheel still bolts to the right side and the axle goes through the center?

Perhaps I'm misunderstanding what paralever actually refers to.

    

172Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 11:21 am

Laitch

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@boostd4 wrote:On the paralever bikes, the wheel still bolts to the right side and the axle goes through the center?

Perhaps I'm misunderstanding what paralever actually refers to.
I'd like to witness the handling of the bike if the axle were offset from the center of the wheel. That might be a groundbreaking—or backbreaking—innovation. I admit I'm not current on motorcycle development but I've almost mastered my relationship with gravity.

Paralever refers to a type of driveline/suspension system. Its design accommodates wheels of that width easily.


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173Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 12:05 pm

BobT

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@boostd4 wrote:So does that mean that monolever or paralever does not matter for retrofitting this wheel on to an earlier bike?  

On the paralever bikes, the wheel still bolts to the right side and the axle goes through the center?

Perhaps I'm misunderstanding what paralever actually refers to.
Why not just do a google image search for K100RS and K100RS 16v and look at the pictures. You will soon understand what a paralever looks like.

    

174Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 12:15 pm

Chocolate

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Hello!

You can change from Monolever to Paralever on a K 2V as the 4V Ks have. The result is a more stable riding and you can put a thicker tire.

Cheers

The first picture shows a Monolever


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

175Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 12:17 pm

boostd4

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Yes, I was misunderstanding it.  For some reason I thought a paralever bike meant that it had a traditional double sided rear swingarm.

Makes much more sense now that the monolever/paralever in and of itself should have no bearing on if the wheel fits.  If the hub/disc happens to be different between the bikes that would change things, but the simple fact that the shaft drive has an additional lower arm should be moot.

    

176Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 12:32 pm

duck

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@Chocolate wrote:

Whoever did that did a really nice job of it.   Twisted Evil

(I did that K75S way back in 2009.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

177Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 1:59 pm

BobT

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@duck wrote:
@Chocolate wrote:

Whoever did that did a really nice job of it.   Twisted Evil

(I did that K75S way back in 2009.)
I would suspect that BMW did it, it looks like a 16v to me.

    

178Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 2:34 pm

duck

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Nope. It's a 91 K75S that I did in 2009.  Here's the whole picture of it.


And here's the dock where it was taken.  The pavement part is landscaped now but it wasn't back then.
https://goo.gl/maps/zeCjE52KuQs


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

179Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 3:09 pm

Chocolate

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@duck wrote:Nope. It's a 91 K75S that I did in 2009.  Here's the whole picture of it.


And here's the dock where it was taken.  The pavement part is landscaped now but it wasn't back then.
https://goo.gl/maps/zeCjE52KuQs

 Big thumb Very nice bike, even the brake lines are new !
Just the stand could have been from a 16 velvet K :-)

Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

180Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Thu Jul 13, 2017 3:54 pm

duck

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@Chocolate wrote:Just the stand could have been from a 16 velvet K

Cheers

Yeah, I was a rookie back then. These days I put the 4V stand on all of my bikes.

Also notice that the rear turn signals were replaced with flush mounted LEDs and the small aux lights mounted under the headlight.

It took a lot of work because when I bought it it was all in pieces. But it only had 20,000 miles on it.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

181Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Jul 14, 2017 7:16 am

Woodie

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Yep, definitely want a red one too now....


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1985 K100RT
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182Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Jul 14, 2017 11:56 am

BobT

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Will and me have red ones, but they say DUCATI on the sides.

    

183Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Jul 28, 2017 8:57 pm

Two Wheels Better

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Kosman Racing made these from stock 17" disc braked rear wheels ages ago. I can find no further evidence that they or the people who bought the company are continuing to widen K bike Y spoke wheels. I stumbled onto this in Seattle today. The K75 owner wondered aloud to a local pair of mechanics what the squeaky noise was in the back end. When told the answer he went out and bought a stock wheel and new set of tyres and told 'em to chuck away the 'problem' wheel. It was the tire rubbing on the swingarm. Also, he'd left out the standard 2mm spacer. The mechanic rang me when he wondered who might be crazy enough to want an 'oddball' K bike wheel. I've hungered for one of these for yonks. It's in my garage now.


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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.
    

184Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Jul 28, 2017 10:16 pm

charlie99

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cant read it but I suspect an oddball tyre size ?

looks like an 18 ?


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

185Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Sat Jul 29, 2017 12:55 am

Two Wheels Better

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@charlie99 wrote:cant read it but I suspect an oddball tyre size ?

looks like an 18 ?
Chazza, it's one of those wheels by Kosman Racing (circa late-'80s to mid-'90s) which got an additional inch added to the diametre and two flanges from 18" Akront rims welded on where most of the stock 17" flange is ground off. It is 4.5" wide. It's as light as a three spoke 18" and the welds look like they were done by a steady, competent hand, or a robot. It uses the then-common size of 160/60ZR18 which we both know well. Luftmeister's Matt Capri sold 'em as his idea.


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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.
    

186Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 2:57 pm

boostd4

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Regarding the original post, the OP stated that the "rare as rocking horse poo 2.5x18" 3 spoke front wheel that came standard on later K75S models but were a little-used option on other models of the era" might fit older vehicles as a direct swap.


I may have a line on a 3-spoke 18x2.5" front wheel from a K75 (doesn't say what year) and the part number listed doesn't come up.  

Can anyone tell me is this a direct swap onto my 1985 K100RS?  Axle/brakes/spacing all the same?

Thanks!

    

187Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 3:11 pm

Laitch

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@boostd4 wrote:
I may have a line on a 3-spoke 18x2.5" front wheel from a K75 (doesn't say what year) and the part number listed doesn't come up.  
Can anyone tell me is this a direct swap onto my 1985 K100RS? 
Go here and compare part numbers.
http://www.maxbmwmotorcycles.com/fiche/PartsFiche.aspx


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188Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 3:26 pm

boostd4

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All the catalogs I can search say that the 18" front K75 (no difference between S/RT/C versions) should be 36-31-2-310-734.

I did search Max BMW can not find a matching part number.  The listing states the part number for this 18x2.5" 3-spoke wheel that came off a K75 is 36-31-2-310-187.  The picture in the auction clearly shows this exact part number.

It does not come up as a good part number on Max BMW.  I work for a BMW car dealer and it doesn't come up on my dealer part search either.  Usually when I use the BMW parts catalog search tool it lists superseded part numbers in case this is an old revised number but nothing comes up.

I guess what I'm asking is if it's a 3-spoke 18x2.5" wheel, I don't see any other models except K75's that took it.  The question is how do I find out if it's a direct swap for my 18" y-spoke 85 k100rs wheel?

[edit]  I searched through almost all of Max BMW and the only models that had an 18" 3-spoke wheel were the 84-88 K75S/C/RT and the K100RS/RTs.  I guess the next step is figuring out if these wheels used a different bearing/axle than the 17" y-spoke wheels - seems unlikely if they were offered on the same year/model bike...

    

189Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 3:39 pm

Point-Seven-five

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As far as I know, the only difference in three spoke wheels is from the 2 valve models(K100, K75) and the 4 valve models(K1, K100RS4V, K1100).

The earlier models are different in the disc mounts.  The later had floating discs, earlier had fixed.  they are not interchangeable unless you change the front brakes and forks.

Hope this helps.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

190Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 3:48 pm

Point-Seven-five

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Just checked the three spoke wheels on my K75's.  Both are stamped with the 310-187 number.

My guess is that the 310-187 number is a lower level part that is assembled with another part to create the 310-734 number in the parts list.  Most likely the 310-734 refers to the solver paint color.  If the wheel was to be painted with a different color, it would still have the 310-187 stamped on it, but the catalog would show a different part number from the 310-734.

Check out the snowflake wheel part numbers where they came in silver, black and white.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

191Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 4:02 pm

Two Wheels Better

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My '87 K100RS (essentially the same front end as an earlier K75 or K100, whether 'Sport' forks or not) now has three spoke wheel from a K75S on it - see avatar image. It was a direct swap from the original Y spoke wheels. They fit, as do the two-pot callipers and 285mm brake discs. Only the K100RS-16V and K1100 series had floating 305mm discs, different axle, callipers, etc.


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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.
    

192Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 4:20 pm

duck

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boostd4All the catalogs I can search say that the 18" front K75 (no difference between S/RT/C versions) should be 36-31-2-310-734.

I did search Max BMW can not find a matching part number.  The listing states the part number for this 18x2.5" 3-spoke wheel that came off a K75 is 36-31-2-310-187.  The picture in the auction clearly shows this exact part number.

It does not come up as a good part number on Max BMW.  I work for a BMW car dealer and it doesn't come up on my dealer part search either.  Usually when I use the BMW parts catalog search tool it lists superseded part numbers in case this is an old revised number but nothing comes up.

I guess what I'm asking is if it's a 3-spoke 18x2.5" wheel, I don't see any other models except K75's that took it.  The question is how do I find out if it's a direct swap for my 18" y-spoke 85 k100rs wheel?

[edit]  I searched through almost all of Max BMW and the only models that had an 18" 3-spoke wheel were the 84-88 K75S/C/RT and the K100RS/RTs.  I guess the next step is figuring out if these wheels used a different bearing/axle than the 17" y-spoke wheels - seems unlikely if they were offered on the same year/model bike...

I have the 2001 ETK and it shows the three spoke front works for all 2V K75 and K100 models.  Which isn't surprising at all.

The 2001 ETK shows the 734 part number but I have both brand new and used front 3 spokes that both have the 187 part number so the part numbering is weird.
New:





Used:


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

193Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 4:36 pm

Two Wheels Better

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Some may recall how the three spoke set, front & rear in correct dimensions, were a dealer installed option for K75 & K100 with the original Y spoke wheels back in the late '80s/early '90s. Could it be the finish changed, or somesuch simple thing? BMW will often change a part number or casting number with no obvious or apparent change to the item.


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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.
    

194Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 5:42 pm

Point-Seven-five

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I am pretty sure the 187 number is the unfinished casting.  When the wheel is painted each of the color options gets a unique part number, otherwise how would you differentiate the silver, black and white options?

On the K100 2v fiche there are three different part numbers for Y spoke wheels depending on color.The 187 number isn't listed on the fiche probably because you couldn't order an unfinished wheel casting.

http://www.maxbmwmotorcycles.com/fiche/DiagramsMain.aspx?vid=51752&rnd=07242017

On the three spoke, they put a part number on silver, but as far as I know never added any other color options.

I think that body panels have some of the same quirks, where a panel in primer has a number and each of the paint options has a different number for the same part, but the number molded on the part matches none of them.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

195Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 5:59 pm

Laitch

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@Point-Seven-five wrote: When the wheel is painted each of the color options gets a unique part number, otherwise how would you differentiate the silver, black and white options?
By their color? Cool


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1995 K75T 68,000 miles
    

196Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 6:05 pm

boostd4

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Wow, awesome insight.

Perhaps then someone could have a peak at the front/back of this wheel (pictured below) and let me know if it has the right brake discs mount/setup to fit my 85 without complication.

http://open.inkfrog.com/images/enlarge/20056818?path=zeXqg8U/262974101910-0_600.jpg&s=51719

http://open.inkfrog.com/images/enlarge/20056818?path=cWXtMnDo/262974101910-2_600.jpg&s=51719

(sorry, tried the [ img ] tags but wouldn't link directly)

    

197Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 6:23 pm

Laitch

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@boostd4 wrote:Wow, awesome insight.
:BW:

Here's another insight. Remove the wheels from your bike, take off the brake assemblies, photograph the wheels, manipulate the images to equalize their dimensions with the dimensions of the photos you've supplied here, make transparent overlays of one of the sets, set them over the other set of images, see if their assemblies align, make a café cubano and go out dancing.


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1995 K75T 68,000 miles
    

198Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 6:30 pm

boostd4

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Not sure if serious....   I was being genuinely appreciative (not sarcastic).

Being a K noob, I wasn't sure if there was an obvious difference that one could spot between an early brake wheel and a floating brake wheel.

    

199Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 6:59 pm

Inge K.

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@boostd4 wrote:  I wasn't sure if there was an obvious difference that one could spot between an early brake wheel and a floating brake wheel.

On early 2V models the discs is mounted by four bolts that goes through the hub,
on the later 4V models (floating) the discs is mounted with six screws on each side.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

200Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 7:24 pm

Point-Seven-five

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@Laitch wrote:
@Point-Seven-five wrote: When the wheel is painted each of the color options gets a unique part number, otherwise how would you differentiate the silver, black and white options?
By their color?
If only...

In an inventory control system that operates on part numbers every item must have a unique number.  Hence parts that get painted will have different numbers to differentiate the color.  Orders are placed by part number at every step from the vendor to the end user.  The inventory control system probably doesn't allow for words.  Those are only there to let the humans know what the p/n represents.

Laitch you are always telling people to read something.  How about you look at the Y spoke front wheel listings in the fiche link I posted?  It will help you understand what I'm talking about.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

201Back to top Go down    Re: Wider Wheels & Radial Tyres on a K100 on Fri Aug 18, 2017 8:45 pm

Laitch

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@Point-Seven-five wrote:Laitch you are always telling people to read something. How about you look at the Y spoke front wheel listings in the fiche link I posted?  It will help you understand what I'm talking about.
I'd need to be interested in understanding the minutiae of inventory control strategy that you're talking about, .75, but I'm not. I just look at the parts fiche. If two different bikes models have the same part number, I'm good to go with the swap. I'm outside the box, where the mists are rising from the rills and the air is redolent of hemlock and oak instead of saturated with odor of laser-generated inventory spreadsheets. Smile


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1995 K75T 68,000 miles
    

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