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Final drive gear ratio

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jwonder
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Re: Final drive gear ratio

Post by jwonder »

Oh, there are those that care Chuck!!!
James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

Dover Rider
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Re: Final drive gear ratio

Post by Dover Rider »

Hey Chuck
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

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schrader7032
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Re: Final drive gear ratio

Post by schrader7032 »

Some bulletins:

- 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
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.

sherman980
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Re: Final drive gear ratio

Post by sherman980 »

Kurt,
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! :)
Thanks.
Chuck S

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