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Chain and Sprocket Calculator

Gearing Calculator - RPM to km/h - mph with Auto Shift Tracer   Enter Gear and Diff Ratios and drag RPM Slider

RPM gauge diagram Speedometer gauge diagram
1st
2nd
3rd
4th
5th
6th
7th
8th

RPM Max RPM

Top Gear

Tire Diameter

Diff Ratio


Shift →
RPM
Slow Fast


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Gear ratio graph diagram
Shift →
RPM
Gear ratio RPM shift point graph diagram
RPM


Max RPM RPM Increments

Tire
R


See also: Printable Full Scale Degree Wheels Dial in your cam - and Printable Timing - Degree Tape

Enter Diff + Gear Ratios and Tire Diameter, then drag RPM slider to calculate speed from RPM.
Drag Max RPM slider to adjust the range of the RPM and km/h Gauges.

Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h.
Compare tires Check Compare and enter alternate Tire Diameter or Diff Ratio to compare. The speedometer will display a second needle for the comparison.

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