BMW K bikes (Bricks)

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1Back to top Go down    final drive ratio on Wed Apr 11, 2012 6:58 pm

BIKER92


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HI I have just purchased a final drive/bevel box from an 1989 k100rt ratio 32/11 and want to know what difference it would make to my 89 k100 rs not sure what ratio but it is the standard one
also will I have to make any changes to speedo etc (only really needed disc but had to buy the full box to get it so just wondering what difference it will make

Thanks Cliff


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Current bikes kawasaki GPZ 900R A3 1987 BMW K100RS ABS 1989
    

2Back to top Go down    Re: final drive ratio on Wed Apr 11, 2012 7:11 pm

charlie99

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cliff the speedo will not be affected at all ...it counts a number of pulses for each revolution of the rear wheel ....and if your using the same one ...its all good

to check your ratio current ratio look om the top side of the bevel box , near the union of the swing arm ....just there you shoukl see stamped into the housing the numbers for the ratio.

history tells us that the rs versions had the taller ratios ...meaning slightly higher speed per engine rev .

forgive me that i cant remember the numbers right at this moment (just woke up ) im a night type person ..,night owl in fact . but the overall conclusion is ....not too much difference

the disc should bolt off the drive in any case ...there should be 2 countersunk retaining screws in the disk face ....carefull as they are made of fairly soft type metal ...and are specified as one use only ...but many of us have been sucessfull at using them again...they arent dear to buy ...so get some in any case

good luck


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

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

3Back to top Go down    Final Drive Ratio on Thu Apr 12, 2012 3:24 am

Lazyboy

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Hi Biker92 The final drive ratio for the K100RS is 33/11


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1984 BMW K100RT

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4Back to top Go down    Re: final drive ratio on Thu Apr 12, 2012 4:23 am

RicK G

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@Lazyboy wrote:Hi Biker92 The final drive ratio for the K100RS is 33/11

No 31/11, 2.81 - 1 and the RT & LT are 32/11, 2.91 The 33/11 was only in the early K100 naked and the 32/10 is for the K75


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

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

5Back to top Go down    Re: final drive ratio on Thu Apr 12, 2012 4:34 am

charlie99

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got it in one rick ....cheers


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

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

6Back to top Go down    Re: final drive ratio on Thu Apr 12, 2012 7:25 am

Lazyboy

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Embarassed Oops at my age I should not try and do something from memory, the brain cells dont always fall into place ! Please see a attched copy of relevent Owners Handbook page.


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1984 BMW K100RT

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