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Old 01-27-2013, 11:48 PM   #1
Kai Ju OP
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Final drive ratio for '77 R100/7

Quick questions regarding what the final drive ratio is supposed to be for a 1977 R100/7.
Both the Haynes and BMW Factory manual state that it's 34/11 while my bike is equipped with a 32/10.
Max's parts catalog lists 34/11, 34/8, 33/11 and 33/12
It certainly would explain my speedo error.
Who's right ?
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Old 01-28-2013, 04:42 AM   #2
oldroadie
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According to Ian Falloon's Original Bmw Air-Cooled Boxer Twins 1950-1996 book the 32/10 was changed to 34/11 at unit number 6147575.
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Old 01-28-2013, 05:28 AM   #3
CanadaBiker
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Quote:
Originally Posted by oldroadie View Post
According to Ian Falloon's Original Bmw Air-Cooled Boxer Twins 1950-1996 book the 32/10 was changed to 34/11 at unit number 6147575.
That would explain a lot for me. My bike is one of the first '77 R100 and has the 32/10. Thankfully, my bike has the matching speedo.

(I looked at Snowbum's chart, and it seems to suggest it should be a 33/11)


Quote:
Originally Posted by Kai Ju View Post
Quick questions regarding what the final drive ratio is supposed to be for a 1977 R100/7.
Both the Haynes and BMW Factory manual state that it's 34/11 while my bike is equipped with a 32/10.
Max's parts catalog lists 34/11, 34/8, 33/11 and 33/12
It certainly would explain my speedo error.
Who's right ?
Kai, besides the speedo error, how do you like the 32/10? I've only put a few miles on mine, but I always wondered if I might want to change it for something taller.
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Old 01-28-2013, 07:00 AM   #4
Kai Ju OP
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oldroadie, mine is 6140566, sounds like I have an early VIN. Thanks for that tidbit of info.

CanadaBiker, I would like to have slightly taller gearing. On most of my street bikes I've changed the gearing to give me a more relaxed cruising rpm.

Kai Ju screwed with this post 01-28-2013 at 07:18 AM
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