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Answers the question, "What rpm will the engine turn at a given mph with X gear ratio or tire size."
Speed (Miles per Hour)
Gear Ratio*
:1
Tire Diameter (inches)
Engine RPM
*Assumes a final drive ratio of 1:1. To calculate rpms with overdrive, or in any other gear, multiply the transmission gear ratio to the rear-end ratio and enter in the box. Ex. if OD is 0.63:1 and rearend is 4.11, enter the result of 4.11 x 0.63
