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1Back to top Go down   What size rubbers do you use? Empty What size rubbers do you use? on Tue Mar 11, 2014 7:01 am

Mike101

Mike101
Silver member
Silver member
Now i've got my K100LT back up and running again it's time to think about new rubber.

But i'm confused about what to go for.

I've trawled through old posts and come up with so many options but none that answer my questions so here goes.

My K has a 140 on the rear when it was shipped with a 130 from new.

What sizes should i be fitting to the front and back and what effect will it have on the handling?  Why fit bigger?  The 140 is very close to the swingarm with less than a 1cm gap.

Also where i live nobody who will fit tyres will mix them up so i have to go for a matched set.  I don't push my K that hard but i will be using it almsot everyday and in all weathers.  So i need high milleage with good grip in the wet.

Any ideas please as i want to get them fitted maybe this weekend and i'll need to order them soon.

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

2Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 7:14 am

92KK 84WW Olaf

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I put on BT45 and they are great in the wet. I don't know about mileage, but there was a set on the LT when I got it and they lasted well. My priority is always good in wet and mileage a long way behind.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles.
    

3Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 7:16 am

JR_K100RS

JR_K100RS
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G'day Mike , most here with stock rims run 110/80/18 front with a 140/& 80/17 rear , these are plus 1 over the stock 100/90/18 + 130/90/17 , handling should be quite neutral , all things considered , as far as brand is concerned I'm sure other will chime in

good luck with it

JR


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

4Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 9:12 am

AL-58

AL-58
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The majority of Ks started with 100/90 front and 130/90 rear(K75c excepted).  At that stage all tyres available for the K were crossplies.

When radial tyres for motorcycles were introduced, BMW introduced them on one of the special edition K100RS's  by fitting that bike with 110/80 front and 140/80 rear radial tyres (Michelin i think maybe).  The rims are the same size.  The standard RS of the time still had the 100/90 and 130/90 combo.

You can fit either, it's a personal choice. Seem to be stickier/sportier tyre choices available in the wider size.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

What size rubbers do you use? K-dogs10
    

5Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 9:30 am

Mike101

Mike101
Silver member
Silver member
Does changing the rear tyre size affect the speedo at all?

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

6Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 9:45 am

the.postman

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@Mike101 wrote:Does changing the rear tyre size affect the speedo at all?

Mike
140/80 looses about 5mm on the radius of the wheel compared to 130/90 so will register higher than actual speed



Last edited by the.postman on Tue Mar 11, 2014 10:08 am; edited 2 times in total (Reason for editing : Maths!!!!!)


__________________________________________________
1985 K100 RS   104EA49840092        #0081788     SILVERish (Madison) Prod. date 05/12/84
1984 srx 600
1986 cbr1000f/h
    

7Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 9:49 am

RicK G

RicK G
admin
admin
Your speedo will read marginal higher with the 140/80 but not that I would be concerned, Around 1.5 - 2mph at 60mph.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

8Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 10:17 am

MikeP

MikeP
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Try Pirelli Demon Sport. Bias-belted but very nearly as good as a radial.


__________________________________________________
1992 K1
1993 K1100R (used to be an LT)
    

9Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 10:28 am

10-ring

10-ring
Silver member
Silver member
I put on the sport demons on the RT last year. It was a big improvment  on wet roads.
So far over 1500 mi. still a lot of tire left. Handling feels very good.

    

10Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Tue Mar 11, 2014 11:24 am

Corkboy

Corkboy
Life time member
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From my investigations, the two main contenders are the Pirelli Sport Demons or the Bridgestone BT45.  From what I've read you can't go wrong with either.

Haven't used the Pirelli, but never had a problem with the Bridgestones.


__________________________________________________
Regards,

Corkboy '87 K100RS SE (The black one - one of the two bikes I'm sorry I sold)
             '87 K100RS 0140995 (Gone)
             '97 K1100LT 0188024 (Gone)
             '08 K1200GT Wedge - but still a K
             '08 Transalp 700
    

11Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 8:39 am

K75cster

K75cster
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If you check most tyre brand web sites they have a tyre ref page, you use the drop down box to select your bike and it will give you the tyres to fit, the above work and the only one not mentioned are the dunlop d404's which come as a matched set, cant say anyone in here have used them of late.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

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.
    

12Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 9:13 am

duck

duck
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Stock sizes - bias ply: Bridgestone Spitfires

Radial (if your installer requires "matched" F&R tires): Avon AV45 110/80-18, AV46 140/80-17


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

13Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 10:07 am

AJ.Valente

AJ.Valente
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I've already done a review of skinny radials, perhaps I need to do another for bias plys.

Radials are not recommended for the Y-spoke rims, so sticking with matched sets of bias-ply's, I can personally recommend Bridgestone (110 BT45 front and 130 Spitfire rear) or a set of Metzler's (100 front and 120 rear). 

I have plenty of notes on various other brands, but it's hard to get information on matched sets. It seems most people people start out with matched sets, but end up replacing the rear tire and viola'--mis-matched sets. 

The most important thing to focus on first is a rear tire. Once you decide on that, it's a simple matter to match up the front. A 130 on the rear is fairly standard, and a good place to start. I've seen bias ply 140s on the rear too, and if you are so inclined there's a wider spacer to help with swing-arm clearance. 

In selecting a front tire you can go with either 100 or 110. If you can't find what you want in a 110, a 100 will still do nicely. Some people have said they prefer 100's over 110s in high speed cornering. I know that's not an issue here, but just repeating what I've read to illustrate the point that there's no need to go with a wider tire up front.

Other brands to consider (recommended at various times on this site) are Dunlop, Continential, Michelin, Avon, Pirelli, and Kenda.


__________________________________________________
'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

14Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 10:36 am

MikeP

MikeP
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@Mike101 wrote:

Any ideas please as i want to get them fitted maybe this weekend and i'll need to order them soon.

Mike
At the risk of repeating myself, as well intentioned as the advice is from members all over the globe, it is worth considering that what works well in their location may not be so good where you ride. There are many things that vary; road surface construction and repair, weather, even the type of road marking materials.


__________________________________________________
1992 K1
1993 K1100R (used to be an LT)
    

15Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 10:38 am

duck

duck
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I can't see why not to run radials on Y-spokes.  The tire doesn't know or care how many spokes the wheel has.

Not sure what kind of surfaces you ride but some areas of the US groove freeway to improve rain drainage and reduce hydroplaning.  A front tire with a straight groove down the middle will track on these grooves. It's not dangerous but it sure is annoying.

Example: Michelin Mac50:

What size rubbers do you use? 633038603227104244m50rear


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

16Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 10:39 am

charlie99

charlie99
VIP
VIP
good words mike


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OWhat size rubbers do you use? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

17Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Wed Mar 12, 2014 10:42 am

Guest

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Am I the only one that buys whatever is on special ?

    

18Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 3:31 am

JR_K100RS

JR_K100RS
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Hmmm , dunno RobinW , for me there are probably three things that I wouldn't muck with on my bike , I get the best I can afford for : brakes , oils and tyres , considering how little rubber is keeping you in touch with terra firma I'd say it's unwise , others may wish to differ

JR


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

19Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 9:53 am

AJ.Valente

AJ.Valente
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@duck wrote:I can't see why not to run radials on Y-spokes.
A while back someone wrote about the differences between the original Y-spoke and the later modified version. The original has a concave outer ring welded to the rim, and I haven't seen the modified version, but am told it is flat.

The outer ring is probably the reason BMW doesn't recommend radials for Y-spoke rims. Radials transfer a lot of energy to the sidewalls, putting extra pressure on this outer ring. Looking at the ring it becomes clear that over time the welds may crack under the added pressure of radial tires. One could surely get away with it in the short term, but give the multitude of road conditions one encounters, year-after-year, the likelihood of damaging the rim on radials seems certain.

Back to the original question; Mike101--just put on a set of Metzler's. They are a good all-round tire and designed especially for BMWs. These are a bit more expensive (here at least), but will give good performance and longevity. For your bike a 130 rear and 100 front will provide excellent stability and cornering.

Enjoy the ride.  Smile


__________________________________________________
'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

20Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 11:45 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I went straight from sidewall cracked old 100/90-18 and 130/90-17 tyres to the plus-one sizes, 110/80-18 and 140/80-17, when I was using Y spoke wheels on my RS, with absolutely no ill-handling or clearance issues whatsoever. I do prefer Pirelli's incredible, radial-like, but bias, Sport Demon tyres for their handling and relatively good tread life, but Bridgies BT45, Michies Pilot Activ (upgraded Macadam) and a few others, work well too.

Duck's concept of a radial BT023 Bridgie and an Avon radial out back is worth considering, but I'm squeamish about mixing brands. The Japanese tyre engineer probably didn't stay up late drinking sake with the Pommie tyre engineer to be sure their tyres work in conjunction with the other brand. We take a lot of chances when we ride, so it comes down to how it personally feels, whether you remain confident about what those relatively thin strips of rubber and silica are doing, making contact with the bitumen under you as you roll.


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

21Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 12:11 pm

duck

duck
Life time member
Life time member
The AV46 "plays well together" with either a BT-023 or a Pilot Road 2 front. (In case you prefer a front tire that stays out late drinking fancy wine and chasing skirts.)


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

22Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 12:48 pm

Mike101

Mike101
Silver member
Silver member
Well around me all i can get fitted are the BT45's or sport demons.

Nobody will mix brands and nothing else is stocked.

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

23Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 12:59 pm

Corkboy

Corkboy
Life time member
Life time member
Well Mike, you're in luck so  Very Happy 

Both of those are ideal for the K.

If you can't decide which one - look (waste a few hours) on the net.  If that doesn't help you make up your mind, flip a coin.

Based on what I read, both will do a good job, and give good mileage.

As regards size, 100/110 or 130/140 - I wouldn't worry on the LT. I'd go for which ever one they had in stock, and if they have both sets, whichever tyre is newer (you can get the manuf. date from the sidewall - have a google if you don't know how).

On saying that, I'd stick with a 100 front and a 130 rear,  or a 110 front and a 140 rear.



Last edited by Corkboy on Thu Mar 13, 2014 4:14 pm; edited 1 time in total


__________________________________________________
Regards,

Corkboy '87 K100RS SE (The black one - one of the two bikes I'm sorry I sold)
             '87 K100RS 0140995 (Gone)
             '97 K1100LT 0188024 (Gone)
             '08 K1200GT Wedge - but still a K
             '08 Transalp 700
    

24Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 2:58 pm

k75RT Keith

k75RT Keith
Silver member
Silver member
Well, it sounds like your choices have been limited for you.  In this case, whichever has the lower price or is in stock should be your deciding factor.

I wouldn't agonize over it.  Both the Sport Demon and BT045 are good tires.

    

25Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 3:06 pm

k75RT Keith

k75RT Keith
Silver member
Silver member
@AJ.Valente wrote:
@duck wrote:I can't see why not to run radials on Y-spokes.
A while back someone wrote about the differences between the original Y-spoke and the later modified version. The original has a concave outer ring welded to the rim, and I haven't seen the modified version, but am told it is flat.

The outer ring is probably the reason BMW doesn't recommend radials for Y-spoke rims. Radials transfer a lot of energy to the sidewalls, putting extra pressure on this outer ring. Looking at the ring it becomes clear that over time the welds may crack under the added pressure of radial tires. One could surely get away with it in the short term, but give the multitude of road conditions one encounters, year-after-year, the likelihood of damaging the rim on radials seems certain.

Back to the original question; Mike101--just put on a set of Metzler's. They are a good all-round tire and designed especially for BMWs. These are a bit more expensive (here at least), but will give good performance and longevity. For your bike a 130 rear and 100 front will provide excellent stability and cornering.

Enjoy the ride.  Smile

BMW doesn't recommend radials on a vintage K bike because of liability issues.  The excuses I've heard are rim design and the suspension isn't designed for radials.  I asked them to explain to me what difference there would be in the suspension when the forks, springs and rear shock all can be used on other motor cycles that can run radials.  Their response to me was  that it's technical, you wouldn't understand.  In the U.S. that's legal talk for we don't want to be held liable.



Last edited by k75RT Keith on Thu Mar 13, 2014 3:07 pm; edited 1 time in total (Reason for editing : Spelling errors)

    

26Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 3:27 pm

duck

duck
Life time member
Life time member
@AJ.Valente wrote:
@duck wrote:I can't see why not to run radials on Y-spokes.
A while back someone wrote about the differences between the original Y-spoke and the later modified version. The original has a concave outer ring welded to the rim, and I haven't seen the modified version, but am told it is flat.

The outer ring is probably the reason BMW doesn't recommend radials for Y-spoke rims. Radials transfer a lot of energy to the sidewalls, putting extra pressure on this outer ring. Looking at the ring it becomes clear that over time the welds may crack under the added pressure of radial tires. One could surely get away with it in the short term, but give the multitude of road conditions one encounters, year-after-year, the likelihood of damaging the rim on radials seems certain.

Back to the original question; Mike101--just put on a set of Metzler's. They are a good all-round tire and designed especially for BMWs. These are a bit more expensive (here at least), but will give good performance and longevity. For your bike a 130 rear and 100 front will provide excellent stability and cornering.

Enjoy the ride.  Smile

This makes no sense. The wheels are CAST so there's no weld to crack.


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

27Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Thu Mar 13, 2014 5:18 pm

Inge K.

Inge K.
VIP
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@AJ.Valente wrote:
@duck wrote:I can't see why not to run radials on Y-spokes.
A while back someone wrote about the differences between the original Y-spoke and the later modified version. The original has a concave outer ring welded to the rim, and I haven't seen the modified version, but am told it is flat.

The outer ring is probably the reason BMW doesn't recommend radials for Y-spoke rims. Radials transfer a lot of energy to the sidewalls, putting extra pressure on this outer ring. Looking at the ring it becomes clear that over time the welds may crack under the added pressure of radial tires. One could surely get away with it in the short term, but give the multitude of road conditions one encounters, year-after-year, the likelihood of damaging the rim on radials seems certain.

Back to the original question; Mike101--just put on a set of Metzler's. They are a good all-round tire and designed especially for BMWs. These are a bit more expensive (here at least), but will give good performance and longevity. For your bike a 130 rear and 100 front will provide excellent stability and cornering.

Enjoy the ride.  Smile

The limited production sport models of the RS from -86 to -89 did all have
y-spoke rims and Pirelli radials fitted from factory.

The reinforced y-spoke with flat sidewalls came late -88.


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

28Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 12:25 am

RicK G

RicK G
admin
admin
@duck wrote:
@AJ.Valente wrote:
@duck wrote:I can't see why not to run radials on Y-spokes.
A while back someone wrote about the differences between the original Y-spoke and the later modified version. The original has a concave outer ring welded to the rim, and I haven't seen the modified version, but am told it is flat.

The outer ring is probably the reason BMW doesn't recommend radials for Y-spoke rims. Radials transfer a lot of energy to the sidewalls, putting extra pressure on this outer ring. Looking at the ring it becomes clear that over time the welds may crack under the added pressure of radial tires. One could surely get away with it in the short term, but give the multitude of road conditions one encounters, year-after-year, the likelihood of damaging the rim on radials seems certain.

Back to the original question; Mike101--just put on a set of Metzler's. They are a good all-round tire and designed especially for BMWs. These are a bit more expensive (here at least), but will give good performance and longevity. For your bike a 130 rear and 100 front will provide excellent stability and cornering.

Enjoy the ride.  Smile

This makes no sense. The wheels are CAST so there's no weld to crack.
+10


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

29Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 9:22 am

Guest

avatar
Guest
@JR_K100RS wrote:Hmmm , dunno RobinW , for me there are probably three things that I wouldn't muck with on my bike , I get the best I can afford for : brakes , oils and tyres , considering how little rubber is keeping you in touch with terra firma I'd say it's unwise , others may wish to differ

JR
So you would stick with xxx even though yyy is 25% cheaper. I recently went to get a set of angels on a bike, they said on the phone they had em. When I got there it was the old 18" excuse, oh I thought it was 17". It's xmas, they won't courier over xmas, how about dunlops for $50 less. I mean, they aren't going to kill you, they'd get sued.

    

30Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 9:30 am

RicK G

RicK G
admin
admin
I get my tyres from http://www.rockymountainatvmc.com/d/12/Motorcycle-Tires heaps cheaper than Oz including freight and takes 4-5 days to deliver.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

31Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 9:34 am

Guest

avatar
Guest
How do you balance the wheel?  Do you fit them yourself?

    

32Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 9:39 am

RicK G

RicK G
admin
admin
I have a guy here that fits them and balances the rear one dynamically and the front I balance myself.
Last time he charged me $13 to do both ends.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

33Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 11:06 am

AJ.Valente

AJ.Valente
Life time member
Life time member
IngeK wrote "The limited production sport models of the RS from -86 to -89 did all have y-spoke rims and Pirelli radials fitted from factory. The reinforced y-spoke with flat sidewalls came late -88."

OK, so they recast the Y-spoke rims after a limited production run, humm.  Why'd they do that? Perhaps they found cracking on the edges of the rim?

So, are the flat sidewall Y-spokes OK for radial tires-is that the conclusion here? 

Wouldn't there be a service advisory on the subject from BMW?


__________________________________________________
'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

34Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Fri Mar 14, 2014 8:48 pm

RicK G

RicK G
admin
admin
The change in rims came midway through the production run on the sports model so both types of rim were used for the radial tyres.
From my knowledge of rims and tyres for motorcycles there is no difference in the rim requirements for radial or cross/bias ply tyres.  However it is advisable that appropriate tyre sizes are used for the rim being used. This is far more important for the Bias ply tyres than Radial construction tyres.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

35Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 2:52 am

charlie99

charlie99
VIP
VIP
the flat sided rims may have coincided the release of the k1 and later
I have a suspicion that it looked different and they wanted to highlight the design changes as they went onto the 16 valve k100 models et al ... also about the same time they started using the 12 rivett output shafts, paralever rear etc
or so im lead to believe
the grooved rims seems appropriate for all the models that used them  so its more like a generational change ?


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OWhat size rubbers do you use? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

36Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 5:19 am

MikeP

MikeP
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Life time member
I understood that the rim change coincided with a change in the alloy owing to rim damage claims.

Having restored both types I can say that the later version does seem to be a slightly harder alloy.

The first batch of K75RTPs we had delivered, had the flat sided rims and came with Dunlop radials from BMW. The tyres weren't a success, not because they were no good but because the front tyre profile was a bit like a Toblerone, very tall in the centre. Once the front had a few hundred miles on it it was okay but when new, at high speeds, the wobble and weave was pretty unpleasant to say the least.


__________________________________________________
1992 K1
1993 K1100R (used to be an LT)
    

37Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 9:39 am

AL-58

AL-58
Life time member
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RobinW wrote:
@JR_K100RS wrote:Hmmm , dunno RobinW , for me there are probably three things that I wouldn't muck with on my bike , I get the best I can afford for : brakes , oils and tyres , considering how little rubber is keeping you in touch with terra firma I'd say it's unwise , others may wish to differ

JR
So you would stick with xxx even though yyy is 25% cheaper. I recently went to get a set of angels on a bike, they said on the phone they had em. When I got there it was the old 18" excuse, oh I thought it was 17". It's xmas, they won't courier over xmas, how about dunlops for $50 less. I mean, they aren't going to kill you, they'd get sued.
Yep, same here.  I'd rather get what I want than what the shop has even if it's cheaper.  I stuck to my guns and got the Angel GTs (even after Pirelli initially delivered a rear 17 instead of an 18, Pirellis fault; the packing slip said 18, the tyre wall 17) and they are worth it.

When I've got stuck and had to accept what was on the shelf because it was my only choice I've invariably ended up with a bike that handled worse for it. Re Dunlops I've had good and bad, good were the D207s on my VTR, truly horrible were the new D220s that came on my TDM, once the rear was worn out I chucked the half worn front too.  The bike became much more enjoyable to ride after fitting new Michelins or Bridgestones or whatever they were.  I tend to stick to Michelin, Pirelli or Metzeler on my road bikes, Bridgestone are OK but don't seem to get the miles out of them.  The sidecar gets car tyres all round, the Super Ten runs Mitas or Heidenau because none of the mainstream brands make a 50/50 tyre (only 90/10 almost roadies or full knobs)


Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

What size rubbers do you use? K-dogs10
    

38Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 9:46 am

duck

duck
Life time member
Life time member
@MikeP wrote:the front tyre profile was a bit like a Toblerone

Sig line material. LOL.


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

39Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 11:29 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
To put it into a timeline: 16V models, (K1, K100-16) came with three spoke wheels not Y spoke so never an issue that a radial wasn't gunna be ridden on those. The 12 rivet outputs are circa 1986, too early for 'common' radials and no three spoke wheels yet in sight.


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

40Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 5:52 pm

AL-58

AL-58
Life time member
Life time member
But BMW themeselves still did fit radials to the Y-spoke wheels in production.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

What size rubbers do you use? K-dogs10
    

41Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sat Mar 15, 2014 8:39 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@AL-58 wrote:But BMW themeselves still did fit radials to the Y-spoke wheels in production.

Al
There's not a question or doubt that they didn't, in my statement. I remember well the radials on the Y spoke wheels of the K100RS.

Introduced in Feb of '86, the K100 RS “Motor sports” with radial tyres of 100/90 VR 18 and 140/80 VR17, fork stabilizer (from K75), black windscreen, footrest plates and Y spoke wheels. Paint was Perlmutt White. The edition was limited to 1,000 bikes.

A useful link: http://www.k100.biz/pdf/K100_dati_produzione.pdf


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

42Back to top Go down   What size rubbers do you use? Empty Re: What size rubbers do you use? on Sun Mar 16, 2014 1:06 am

JR_K100RS

JR_K100RS
Life time member
Life time member
@AL-58 wrote:
RobinW wrote:
@JR_K100RS wrote:Hmmm , dunno RobinW , for me there are probably three things that I wouldn't muck with on my bike , I get the best I can afford for : brakes , oils and tyres , considering how little rubber is keeping you in touch with terra firma I'd say it's unwise , others may wish to differ

JR
So you would stick with xxx even though yyy is 25% cheaper. I recently went to get a set of angels on a bike, they said on the phone they had em. When I got there it was the old 18" excuse, oh I thought it was 17". It's xmas, they won't courier over xmas, how about dunlops for $50 less. I mean, they aren't going to kill you, they'd get sued.
Yep, same here.  I'd rather get what I want than what the shop has even if it's cheaper.  I stuck to my guns and got the Angel GTs (even after Pirelli initially delivered a rear 17 instead of an 18, Pirellis fault; the packing slip said 18, the tyre wall 17) and they are worth it.

When I've got stuck and had to accept what was on the shelf because it was my only choice I've invariably ended up with a bike that handled worse for it. Re Dunlops I've had good and bad, good were the D207s on my VTR, truly horrible were the new D220s that came on my TDM, once the rear was worn out I chucked the half worn front too.  The bike became much more enjoyable to ride after fitting new Michelins or Bridgestones or whatever they were.  I tend to stick to Michelin, Pirelli or Metzeler on my road bikes, Bridgestone are OK but don't seem to get the miles out of them.  The sidecar gets car tyres all round, the Super Ten runs Mitas or Heidenau because none of the mainstream brands make a 50/50 tyre (only 90/10 almost roadies or full knobs)


Al
Yup , X2 on your comments AL-58 , I do my homework , decide what I need and go and get it , price is secondary when it comes to my top three

JR


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

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