247SportTools
Cycling · Setup

Bike Gear Ratio Calculator

Calculate gear ratio, gain ratio and speed at a given cadence for any chainring and sprocket.

Gear ratio & speed

Gear ratio

Top picks compared

PickProductBest for
Top pick Cassette (Wide-Range) A wider-range cassette gives easier climbing gears and better ratios. Check price →
Option Chainring Set Swap chainrings to tune your gearing for terrain and fitness. Check price →
Option Chain Wear Tool Check chain stretch so your gears shift cleanly and last longer. Check price →

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Frequently asked questions

What's a good gear for climbing?

For steep climbs you want a low gear (small chainring, large sprocket) — e.g. a 34-tooth ring with a 32-tooth cog gives roughly a 1:1 ratio, letting you spin up gradients without grinding.