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Gearing & Lap Times
Calculate gear inches, rollout, speed and lap times for your gearing.
Target performance
Enter your target lap time and cadence. We will search every combination from 48–75T chainrings and 9–20T sprockets.
Linked to target time and timed distance. You can edit time or speed.
Matching gears
Enter a target lap time and cadence to see the closest ratios.
Matches gearing to a steady speed and cadence. It does not predict the power needed or a standing start. Gear inches use the 27-inch track convention; rollout uses tyre circumference.
Your gearing
Enter your chainring and sprocket. Add cadence or speed to calculate the other.
Your gear
Gear inches
Rollout
Race setup
Add your first-lap time in seconds. Remaining laps use the speed above.
Estimated race and lap times
Total race time
Average lap time
Enter a speed or cadence and your first-lap time to estimate the race and average lap times.
