BMW K bikes (Bricks)

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1Back to top Go down   Wheel help Empty Wheel help Thu Sep 19, 2013 11:36 am

thumperslaw

thumperslaw
Silver member
Silver member
Need some info on wheels

I want to fit the 3 spoke wheel 18 inch to the rear (i found a nice tyre) 

do the three spoke bolt on to the swingarm?  I am not going to run a really wide tyre


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

2Back to top Go down   Wheel help Empty Re: Wheel help Thu Sep 19, 2013 7:04 pm

Comberjohn

Comberjohn
Life time member
Life time member
You can bolt the K1100LT or RS three spoke wheel straight in to the K100. The LT uses the same tire size as the K100 but the RS uses a wider radial.
If you use the wider RS wheel you will need to remove the centre stand or find an RS one. Some who have done the mod have found that sometimes the tire fouls the exhaust. Although I tried it and it cleared with no problem.


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

3Back to top Go down   Wheel help Empty Re: Wheel help Thu Sep 19, 2013 7:45 pm

88

88
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Life time member
@Comberjohn wrote:You can bolt the K1100LT or RS three spoke wheel straight in to the K100. The LT uses the same tire size as the K100 but the RS uses a wider radial.
If you use the wider RS wheel you will need to remove the centre stand or find an RS one. Some who have done the mod have found that sometimes the tire fouls the exhaust. Although I tried it and it cleared with no problem.
have you done that mod on the current bike CJ? Did you need to change the centre stand?


__________________________________________________
Wheel help Ir-log11 88....May contain nuts!Wheel help Ir-log11

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

K1100LT 1992 - AKA Big Red
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K1/RS - AKA Titan (unique hybrid by Andreas Esterhammer)
    

4Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 5:48 am

thumperslaw

thumperslaw
Silver member
Silver member
Is the k1100lt wheel 18inch?


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

5Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 11:19 am

thumperslaw

thumperslaw
Silver member
Silver member
So my plan is to fit a k1100rs wheel with a narrow tyre

Could i keep the k100 shaft drive system then? I've not got centre stand and my exhaust are changed


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

6Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 1:34 pm

Comberjohn

Comberjohn
Life time member
Life time member
Hi thumper. Yes, the RS uses an 18" rear rim but it is wider for the lower profile radial tyre.
Be very careful about putting a narrow tyre on it. Sounds iffy, maybe dangerous. Can't afford to lose any forum members.
Both the LT 17" and the RS 18" should fit straight in to the monolever rear on the 8v K's.
Hi Will. No, haven't bothered with this one. To busy riding it.
Although, my old LT is for sale.
Winter project maybe...


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

7Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 2:02 pm

MikeP

MikeP
Life time member
Life time member
@thumperslaw wrote:So my plan is to fit a k1100rs wheel with a narrow tyre
The RS wheel is 4.5" wide and the LT one is 3.5". If you fitted a tyre for the LT to the RS rim it would stress the bead and alter the profile, flattening it. The K1100LT takes a 140/18 so you would get a bit more rubber than the K100.

I have a K1100LT that I'm looking to fit 1100RS wheels to. I'd offer to swap but I need to source a suitable front wheel.


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

8Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:05 pm

thumperslaw

thumperslaw
Silver member
Silver member
So let's get this right k1100lt rear wheel is 18inch right?


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

9Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:11 pm

thumperslaw

thumperslaw
Silver member
Silver member
And will bolt right on

Sorry it's been a long day


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

10Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:23 pm

thumperslaw

thumperslaw
Silver member
Silver member
The tyre I want to fit
Wheel help Null_zps377fb6d5


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

11Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:25 pm

Guest

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Guest
The K100RS 16v is also 18". I think that they are the same as the 1100.
MikeP, I have a pair of 3 spoke 16 valve wheels here front and back. Catch a ferry and come down, we can sort out a price :-)

    

12Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:34 pm

thumperslaw

thumperslaw
Silver member
Silver member
And how wide are the rs rear wheel?

Still unsure if they make a narrow 3 spoke rear wheel in 18 inch


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

13Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:39 pm

Comberjohn

Comberjohn
Life time member
Life time member
Nope. Doesn't exist.


__________________________________________________
Life is not a rehearsal.
2010 VFR 1200F DCT 
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

14Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:50 pm

MikeP

MikeP
Life time member
Life time member
@thumperslaw wrote:And how wide are the rs rear wheel?

Still unsure if they make a narrow 3 spoke rear wheel in 18 inch
The three spoke rear wheel is in two sizes:

3" x 17" OE fit for K75S, K100LT and K1100LT. The standard tyre sizes are 130/17 for the K75 & K100, 140/17 for the K1100LT, all are bias-belted (crossply).

4.5" x 18" fit for K1, K100RS 16v and K1100RS. All take 160/18 Radial tyre.

So the answer is no. There's no 3" x 18" rear wheel.


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

15Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:50 pm

thumperslaw

thumperslaw
Silver member
Silver member
Right so am stuck with k1100rs wheel then


I could use k75 with the old drum brake set up :/


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

16Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:52 pm

MikeP

MikeP
Life time member
Life time member
bikerboy wrote:
MikeP, I have a pair of 3 spoke 16 valve wheels here front and back. Catch a ferry and come down, we can sort out a price :-)
I wonder what the shipping costs would be?


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

17Back to top Go down   Wheel help Empty Re: Wheel help Fri Sep 20, 2013 3:54 pm

MikeP

MikeP
Life time member
Life time member
@thumperslaw wrote:Right so am stuck with k1100rs wheel then


I could use k75 with the old drum brake set up :/
Yes but you'd need to change the final drive housing (and the brake pedal stuff), plus it would be the old design. The three spoke wheel was only fitted to K75 models after the 'C' designation was dropped and all models had a disc rear brake.


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

18Back to top Go down   Wheel help Empty Re: Wheel help Sun Sep 22, 2013 4:43 pm

thumperslaw

thumperslaw
Silver member
Silver member
Running a narrow tyre on such a wide rim is not the best idea
I don't really use the rear brake so drum would not bother me


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

19Back to top Go down   Wheel help Empty Re: Wheel help Sun Sep 22, 2013 9:31 pm

AL-58

AL-58
Life time member
Life time member
18" wheels

K75C (8 spoke)- narrow 18" with drum

K100RS-16v and K1100RS (3 spoke)- wider 18" with disk.

There is no 3 spoke narrow 18" wheel available.  The 1100LT 3 spoke is a 17"

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 

'87 K100RT with Paralever backend

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

Wheel help K-dogs10
    

20Back to top Go down   Wheel help Empty Re: Wheel help Mon Sep 23, 2013 6:51 am

thumperslaw

thumperslaw
Silver member
Silver member
Thanks for info

Is the gearing the same on the k75c like the k100


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

21Back to top Go down   Wheel help Empty Re: Wheel help Tue Sep 24, 2013 7:46 am

K75cster

K75cster
Life time member
Life time member
Straight off the shelf the K75c drum wheeled final drive is a 3.2:1 ratio AS IS MOST k75 fd's drum or disc and the K100rt is 2.9:1 and the K100RS IS 2.8:1, but it would be possible to use the final drive of your choise in the drum casing if you so choose. But just running a straight K75 drum rear will see you doing 4200rpm at 100kph, so its like 400rpm more than you are used to, perhaps like driving a 3speed auto after using a 4speed for ages you notice the rpm.


__________________________________________________
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.
    

22Back to top Go down   Wheel help Empty Re: Wheel help Tue Sep 24, 2013 8:56 am

thumperslaw

thumperslaw
Silver member
Silver member
Don't do loads of riding on it any way. 

Would i leave the drive shaft and then bolt the final drive bit on?


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

23Back to top Go down   Wheel help Empty Re: Wheel help Tue Sep 24, 2013 9:00 am

thumperslaw

thumperslaw
Silver member
Silver member
this bit i mean 

Wheel help Bmwchop_zps33bbab81


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

24Back to top Go down   Wheel help Empty Re: Wheel help Tue Sep 24, 2013 4:12 pm

AL-58

AL-58
Life time member
Life time member
Yes, almost.

The drumbrake final drive will bolt on, but you will have to also change the brake pedal and linkage as your rear brake pedal/master cylinder will no longer be of any use.

One other thing to consider is the final drive spline itself.  The earlier drives have a 16 tooth spline, the later drives a 20 tooth spline. 

Your 'new' drumbrake final drive may or may not be the same spline count as your existing final drive.  If it is, it will slip straight on.  If it's not you will need to replace the driveshaft also.


So your shopping list is:


  1. A drumbrake final drive


  2. Brake pedal and linkages to suit


  3. An 18" rear wheel


  4. Possibly a driveshaft to match the spline on the final drive



Al



Last edited by AL-58 on Tue Sep 24, 2013 8:04 pm; edited 1 time in total


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 

'87 K100RT with Paralever backend

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

Wheel help K-dogs10
    

25Back to top Go down   Wheel help Empty Re: Wheel help Tue Sep 24, 2013 6:37 pm

thumperslaw

thumperslaw
Silver member
Silver member
Hi thanks Al for your info
Got a BMW breaker right down the road from my house and will pop over Wednesday afternoon for chat.
See if I can come to some deal with him for my old stuff


__________________________________________________
K100 "ratrod" , VTR firstorm, stunted up srad 750, gsxr 750m (sold) , '86 slabby (Sold)
    

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