Cyclist's Gears
Reckonersweight 1reckoner · computes, doesn't store
Ask three cyclists about gearing and you will receive four opinions and a diagram drawn on a napkin. Cyclist's Gears does the actual arithmetic — what your chainrings, sprockets, and wheel size add up to on the road — so you can compare setups with numbers instead of folklore. It computes your gearing and keeps nothing; the napkin is finally free for coffee.
This is not a screenshot. It's the real tool, running right here — go on, put something in it.
Open the demo full-screen: /demos/cyclists-gears.html
Questions people ask
How do I compare gearing between different cassettes or chainrings?
Enter each setup's numbers and it computes what every combination gives you, so you can lay two options side by side. The winter-project decision gets made with arithmetic instead of forum threads.
Does this gear calculator need an account or a connection?
No — it is a single HTML file that runs offline in your browser, computes on the spot, and stores nothing. It works in the shed, next to the bike, where these questions actually come up.
Who needs a bicycle gear calculator?
Tourers gearing down for mountains with luggage, fixed-gear riders choosing their one ratio very carefully, and tinkerers mid-rebuild. Anyone who has ever wondered whether the new cassette will actually feel different — this tells you by how much.
Fits your knife at weight 1. Nothing here is final — Knife follows Life. Reforging within your tier is free, forever. Add it, drop it, reforge later; the file stays yours either way.