Compare gear ratios

Choose use (road, gravel, MTB or eMTB), chainring setup and full cassette, then tyre size. The chart shows speed at a fixed cadence — 100 rpm by default.

Cadence 100 rpm

Speed per cog

X axis

Value

Interactive chart: hover a point for values. km/h depend on cadence; rollout metres do not.

Hover a point on the chart to see values.

Ratio table

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How it is calculated

ratio = chainring / cog

rollout (m) = ratio × circumference (m)

speed (km/h) = rollout × cadence × 60 / 1000

Notes

Database includes Shimano, SRAM and Campagnolo cassettes from 8 to 13 speeds.
Tyre circumferences are typical values; enter your measured value for precise comparison.
Your setups are saved in the browser. Tool interface labels may appear in Italian for some dynamic fields.