Enter birth year and racing year to see the category for each country.
| Category | Limit |
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Saved setups
Setups are stored in this browser only. Use a share link to move one to another device.
Check a specific combination
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Edit either field and the other follows.
⚠ 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. Always verify current federation limits before racing.
This site is run in good faith as a free resource. The limits are checked against each federation's published rules, but rules change during the season and mistakes are possible, so nothing here is a guarantee that a bike will pass inspection. No liability is accepted for equipment decisions or race results based on this tool. If a number looks wrong, email hello@youthgearing.co.uk and it will be checked against the source document.
This site is run in good faith as a free resource. The limits are checked against each federation's published rules, but rules change during the season and mistakes are possible, so nothing here is a guarantee that a bike will pass inspection. No liability is accepted for equipment decisions or race results based on this tool. If a number looks wrong, email hello@youthgearing.co.uk and it will be checked against the source document.
Set your parameters and click Calculate Best Gears
Generate a gear ratio or metres development matrix for any chainring and sprocket range.
Showing chainring ÷ sprocket ratios.