Hi Mark,
My 1960 R50 n° 561145 has a 25/8 rate in is final drive gear, and the speedometer is a 0.75 . Is this correct?
The rear wheel is 18 -4.00 (this is not correct, I know) .... and with the 4th gear the bike cannot reach the top speed (130-140 Km/h) and the maximum RPM ; do I need to change the tire?
Thanks.
Michele
R50 Final drive
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Mark Huggett
Re: R50 Final drive
Hi Michele
The speedo that you have is correct, and the rear tire should be a 3.50 x 18". The reason why you cannot reach a higher speed with the R50 is most likely due to the larger tire. I would change it if I were you.
Only the R69S changed to a 4.00 x 18" later in the mid 1960's and therefore the speedo was also changed from a 0.75 way speed to 0.77 to correct the reading due to the larger tire.
Hope that answers your questions.
Best regards,
Mark
Mark Huggett GmbH
The speedo that you have is correct, and the rear tire should be a 3.50 x 18". The reason why you cannot reach a higher speed with the R50 is most likely due to the larger tire. I would change it if I were you.
Only the R69S changed to a 4.00 x 18" later in the mid 1960's and therefore the speedo was also changed from a 0.75 way speed to 0.77 to correct the reading due to the larger tire.
Hope that answers your questions.
Best regards,
Mark
Mark Huggett GmbH