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Final drive gear ratio
- jwonder
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Re: Final drive gear ratio
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
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Re: Final drive gear ratio
Thanks for the ruminations on final drives. I was following a path for the R50s and correct speedo drives in kph and mph. Very limited # with 25/7 but what about 27/8 and 25/8 applications?( Barrington). Assuming the later being a better highway application.
Thanks
- schrader7032
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Re: Final drive gear ratio
- vented drive introduction - http://www.beemergarage.com/documents/200.pdf
- 27/8 drive for use with 4.00x18 tire - http://www.beemergarage.com/documents/267.pdf
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: Final drive gear ratio
GREAT detective work!! Appreciated! (Figures John would have just the bulletin needed in his collection!). Guess my "VERY original" '61 R69S with the vented rear drive wasn't as "original" as I thought!
Chuck S