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Bicycle gear ratio calculator

Builds a speed table for every combination of chainring and cassette sprocket. A configurable crankset (one to three rings), a cassette of up to ten sprockets and the tyre size let you check what speed a given cadence produces.

GearCalculator

{{ t.subtitle }}

{{ t.secConfig }}
{{ t.tireUnit }} {{ t.tireCirc }} {{ circumferenceStr }} m
⚠ {{ tireError }}
{{ t.cadUnit }}
⚠ {{ cadenceError }}
{{ t.secKorba }}
{{ t.ringLabel }}
Z{{ i+1 }} {{ t.teeth }}
{{ t.secKaseta }}
{{ t.sprLabel }} {{ cassetteCount }}
{{ i+1 }}
{{ t.secSpeed }} {{ t.speedAt }} {{ cadenceStr || 90 }} {{ t.cadUnit }}
{{ t.colRearFront }} Z{{ ci+1 }} · {{ teeth }}T
{{ validCassette[ri] }}T {{ spd.toFixed(1) }}
{{ t.emptyTable }}
km/h {{ leg.label }}

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This calculator was a by-product of other work. Day to day we design electronic devices and measurement data acquisition systems to order.


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