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RPM vs Speed vs Tire size
if you don't know the ratios, you should not be even worrying about it. agreed it is not as accurate, but .05% error is not too bad.- m-35tom
- Post #44
- Forum: Deuce Modification and Hot-Rodding
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RPM vs Speed vs Tire size
too complicated, this is the simple version. rpm = (168 * mph * ratio ) / radius mph = ( rpm * radius) / ( 168 * ratio)- m-35tom
- Post #42
- Forum: Deuce Modification and Hot-Rodding
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RPM vs Speed vs Tire size
Basic formula is: rpm = (168 * mph * ratio ) / radius Where:"rpm" is engine speed in rpm "mph" is road speed in mph "ratio" is product of all ratios, in your case ratio = 0.79 * 1.0 * 6.72 = 5.309 "radius" is the distance from the ground to the center of the axle shaft. Or if you want to solve...- m-35tom
- Post #30
- Forum: Deuce Modification and Hot-Rodding