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1Back to top Go down   final drive ratio  Empty final drive ratio 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   final drive ratio  Empty Re: final drive ratio 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%Ofinal drive ratio  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 ..
    

3Back to top Go down   final drive ratio  Empty Final Drive Ratio 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

Bikes Name: Lazyboy
    

4Back to top Go down   final drive ratio  Empty Re: final drive ratio 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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"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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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

charlie99

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got it in one rick ....cheers


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

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

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

Lazyboy

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.final drive ratio  K100_g13


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1984 BMW K100RT

Bikes Name: Lazyboy
    

7Back to top Go down   final drive ratio  Empty Lower revs K100? Wed Mar 02, 2022 8:18 am

Kafflut

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I'm asking this question on behalf of my friend Phil. I've also hankered after lower revs on my K100 and there may well be others too. Or maybe someone who's done it.

Has anyone ever changed the bevel drive ratio on their K100RS ? The R1200C has a bevel ratio of 2,54 ; I think 28 + 11 teeth. This would make the bike a ( hopefully ) much nicer tourer, dropping revs by about 9% ( 2,82 standard ratio ). I think the 2,82 ratio is 31 + 11 teeth.

The problem is : are the bevel gears interchangeable? Obviously the housings aren't but the innards may be interchangeable.

http://bmwk100k75.weebly.com/
    

8Back to top Go down   final drive ratio  Empty Re: final drive ratio Wed Mar 02, 2022 3:16 pm

Two Wheels Better

Two Wheels Better
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Kafflut wrote:I'm asking this question on behalf of my friend Phil. I've also hankered after lower revs on my K100 and there may well be others too. Or maybe someone who's done it.

Has anyone ever changed the bevel drive ratio on their K100RS ? The R1200C has a bevel ratio of 2,54 ; I think 28 + 11 teeth. This would make the bike a ( hopefully ) much nicer tourer, dropping revs by about 9% ( 2,82 standard ratio ). I think the 2,82 ratio is 31 + 11 teeth.

The problem is : are the bevel gears interchangeable? Obviously the housings aren't but the innards may be interchangeable.
There's a bloke in Oz who's swapped R1200C guts into his K100/K1100 final drive for a relaxed cruise. It can be done, and requires careful shimming.


__________________________________________________

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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-P & 2022 S1000XR



"We take our bearings, daily, from others. To be sane is, to a great extent, to be sociable."

~John Updike.
    

9Back to top Go down   final drive ratio  Empty Re: final drive ratio Wed Mar 02, 2022 3:17 pm

92KK 84WW Olaf

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Kafflut wrote:I'm asking this question on behalf of my friend Phil. I've also hankered after lower revs on my K100 and there may well be others too. Or maybe someone who's done it.

Has anyone ever changed the bevel drive ratio on their K100RS ? The R1200C has a bevel ratio of 2,54 ; I think 28 + 11 teeth. This would make the bike a ( hopefully ) much nicer tourer, dropping revs by about 9% ( 2,82 standard ratio ). I think the 2,82 ratio is 31 + 11 teeth.

The problem is : are the bevel gears interchangeable? Obviously the housings aren't but the innards may be interchangeable.
The inners are interchangable, just not sure the exact ones. I do have a file someplace setting out suitable ones but I think you are on it. You need a matched pair. The big bearings are the same in a lot of final drives too.


__________________________________________________
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 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

10Back to top Go down   final drive ratio  Empty Re: final drive ratio Thu Mar 03, 2022 12:44 am

Kafflut

Kafflut
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Silver member
Thanks Olaf .. I will forward the message to Phil

http://bmwk100k75.weebly.com/
    

11Back to top Go down   final drive ratio  Empty Re: final drive ratio Thu Mar 03, 2022 6:36 am

92KK 84WW Olaf

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Kafflut wrote:Thanks Olaf .. I will forward the message to Phil
Unfortunately the man that as going to do it passed last November. A local ex BMw man and the go to man for rebuilding final drives.He said it only required shimming and 'why on earth would you want to do that'!!!.


__________________________________________________
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 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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