Engine RPM's vs. Gear Ratios & Tire Size

By: Charles E. Giannetta



Fill in all 4 fields, then CLICK OUTSIDE the field box, to find Engine RPM's

NOTE: You can leave "Speed" and "Tire Size" a constant to find the effects of changing gear ratio's!!
Just CLICK OUTSIDE the box again after making any changes!

Tire Diameter in inches, ex. 25.6

Rear Axle Ratio, ex. 4.11

Tranny Gear Ratio, ex. 4th = 1.00

Cruising Speed MPH

ENGINE RPM's =

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