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JSeery · 05-08-2020, 07:40 PM

Just be sure you group all the numerator and divide by the denominator.

RPM=(mph x gear ratio x 336) / tire dia

Handy formula, you can also solve it for the MPH or to determine the effect of different Gear Ratios or Tire Sizes on MPH or RPM.

05-08-2020, 07:40 PM	#4
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: A question of R.P.M. Just be sure you group all the numerator and divide by the denominator. RPM=(mph x gear ratio x 336) / tire dia Handy formula, you can also solve it for the MPH or to determine the effect of different Gear Ratios or Tire Sizes on MPH or RPM.