⚠ Important: This tool provides estimates only. Results depend on the accuracy of your inputs and may vary with tyre condition, temperature, surface, wear, and rider weight. A physical rollback test is the definitive compliance check accepted by race commissaires. No liability is accepted for equipment decisions based on this tool. Always verify current federation limits before racing.
Quick Reference · All Limits
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Results
Set your parameters and click Calculate Best Gears
Gear Ratio & Metres Development Table
Generate a gear ratio or metres development matrix for any chainring and sprocket range.
Showing chainring ÷ sprocket ratios.