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Gear Ratio Calculator

Transmission Data

Gear 1st 2nd 3rd 4th Ring and Pinion
Tire Size
Diameter Rollout
Inches cm
Maximum RPM


1. Enter your gear ratio information, or use mine as the default.
2. Set your engine's maximum RPM or Rev-limiter point.
3. Calculate MPH,
Use the chart to determine the RPM drop for each gear at speed.