BMW K bikes (Bricks)

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Finnigan

Finnigan
Silver member
Silver member
I know that if you want a wider rear wheel the popular route is to get an 1100 rear.  This is 4.5" wide (i think) but I was wondering if anyone had put something a little bigger on.  I'm looking into a 5.5" rear wheel but am concerned about the swingarm clearance.

If i'm in uncharted waters I'll do my best and post up the results.

Thanks everyone


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1990 k100LT
    

JR_K100RS

JR_K100RS
Life time member
Life time member
G'day Finnigan , when I fitted up a 4.5x18 rear rim with a 160/60/18 tyre to my K100RS I ended up with the following clearances : after grinding back the rib on the inside of the monolever , with the 2mm spacer removed I had 4mm between the tyre & monolever , on the other side after also grinding the left foot of the K1100 centre stand I was able to get 6mm of clearance , so in short pretty tight back there , you may be able to squeeze in a 170 section tyre at the biggest , just keep that in mind when you research fitting a 5.5inch ( x 17 inch ? ) rim

good luck with it

JR


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

RicK G

RicK G
VIP
VIP
Only a 4.5 but if you hang around for a while I have a 17 x 5 coming from Ireland for my K75 chookie


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"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

robmack

robmack
Life time member
Life time member
There are posts on the K11OG forum (and I started one briefly on this forum) about fitting K1200 5-spoke wheels to the K100.  There are success stories where owners have fitted the 5X17 and 5.5X17 rear wheels.  The former requires modifications to the center stand and different bolts, and the latter requires that plus shaving parts off of the swingarm.  It is doable.


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Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

RicK G

RicK G
VIP
VIP
It's going on a paralever so I don't expect problems just a better selection of dual purpose tyres.


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"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

Ringfad

Ringfad
Life time member
Life time member
I have a 5.0 17" K1200 rear wheel fitted in my K100 16V running a 17" 160/70 BT023 tyre.  (I picked this up  wheel and new tyre for £63  Very Happy )

This fitted with no modifications at all.

I also have a 5.5 K1200 rear wheel with a 180 tyre but this appears to require a lot of modifications to make it fit so using the chart below I am going to try a 170 tyre.

Note the OD for 160/70 17" is very close to the OD for the original 18" tyre. 654 vs. 647 mm so hopefully speedo is reasonably correct.

I am also in the process of fitting a K1200 5 spoke to the front  and now just need to get a tyre  to finish this.

The K1200 uses a 20mm wheel spindle and our K's use a 25mm spindle so bearings etc. need to be changed

Has Anyone Fitted A Wheel Wider Than 4.5"? Bt02310


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Has Anyone Fitted A Wheel Wider Than 4.5"? Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

Finnigan

Finnigan
Silver member
Silver member
Thats great data, thanks

Gives me some hope of this project actually working out


__________________________________________________
1990 k100LT
    

Ringfad

Ringfad
Life time member
Life time member
Don't forget the K100 16V is fitted with a paralever, I did try the K1200 wheels in my 8v but no success.

As discussed earlier in the post, lots of modifications are required to fit wider wheels to an 8v bike but in can be done.


1984 K100 with K1200 wheel's and ABS !


Has Anyone Fitted A Wheel Wider Than 4.5"? Dscf4310


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Has Anyone Fitted A Wheel Wider Than 4.5"? Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

sidecar paul

sidecar paul
Life time member
Life time member
I saw an early K100 with a K1200 rear wheel when camping last weekend. I was told the only mod was to fit two of the steel spacers. It's a well used bike so it obviously works.

Has Anyone Fitted A Wheel Wider Than 4.5"? Sam_0810


There wasn't much clearance between the swing arm and tyre, but no evidence of the tyre making contact.
Unfortunately, I didn't make a note of the tyre size.

Has Anyone Fitted A Wheel Wider Than 4.5"? Sam_0811

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

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