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Re: Final drive gear ratio

Posted: Sun Jul 31, 2022 7:05 pm
by jwonder
Oh, there are those that care Chuck!!!

Re: Final drive gear ratio

Posted: Mon Aug 01, 2022 12:06 am
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

Re: Final drive gear ratio

Posted: Mon Aug 01, 2022 7:30 am
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

Re: Final drive gear ratio

Posted: Mon Aug 01, 2022 10:25 am
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! :)