Motorcycle Gearing & Top Speed Calculator

Find your theoretical top speed from engine RPM, gear ratios, sprockets, and tire dimensions.

Engine RPM

Primary Reduction Ratio

Gear Ratio

Front Sprocket (teeth)

Rear Sprocket (teeth)

Tire Circumference (mm)

Rolling circumference in mm

Final Drive Ratio

2.81 : 1

Wheel RPM

1,684 rpm

Theoretical Top Speed

122.3 mph

Theoretical Top Speed

196.9 km/h

Want to understand the numbers?

Read the step-by-step guide, worked example and common questions for this calculator.

Speedometer Error

Compare indicated vs GPS speed, or see how a tire size change affects your speedometer reading.

Chain Length

Get the right chain link count from sprocket sizes, centre distance, and chain pitch.