Rollout Calculator
Take the guesswork out of youth gear checks. Rollout Calculator instantly computes rollout distance and helps riders, parents, and coaches pick wheel, tyre, chainring and sprocket combinations that meet age‑group limits.

What it does
- Calculate rollout for any wheel / tyre / chainring / sprocket setup quickly and accurately.
- Generate valid gear combinations for a selected age category and rank them by how close they are to the maximum permitted rollout.
- Browse and submit real race‑tested setups in the community library to see what other riders use.

Key features
- Accurate rollout calculator — Factors in wheel diameter, tyre size, and gearing to produce a precise rollout distance.
- Combination generator — Suggests practical chainring and sprocket options for your age category and sorts them by margin to the limit.
- Community library — View and share actual race combinations to learn from other riders and coaches.
- Fast results — Get answers in seconds, no spreadsheets or manual measuring required.
- Race‑ready guidance — Helps avoid last‑minute gear changes at sign‑on and reduces setup stress on race day.

How to use
- Enter wheel and tyre dimensions plus chainring and sprocket sizes.
- Use the main calculator to see the rollout distance for your exact setup.
- Use Generate to find compliant combinations for your age group and compare options.
- Visit the Community page to submit or review real race setups.

Who it’s for
Young riders, parents, coaches, and club volunteers who want a simple, reliable way to check youth gear limits and prepare confidently for race day.

Privacy & support
Rollout Calculator respects your privacy, community submissions are anonymous. For support or feedback, use the in‑app help.