Thread: gear ratio
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05-25-2010 07:34 PM #1
CHR Member/Contributor
- Join Date
- Sep 2007
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- Gardner, KS
- Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
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The calculator Randyr linked you to uses a formula where Cruise RPM = (MPH x gear ratio x 336 x OD ratio) / Tire Diameter in inches. Plugging in your 2.76 rear gear ratio and no OverDrive (1.0 for top gear) your 25" tires pushed you to 2597rpm at 70mph, and your new 30" tires will drop that to 2164rpm with no other changes. The 336 is just a factor to align units and give you RPM.Roger
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Ditto on the model kits! My best were lost when the Hobby Shop burned under suspicious circumstances....
How did you get hooked on cars?