Gear Ratio Calculator

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Gear ratio, development and speed for your drivetrain — highlighting unfavorable chainline combinations and overlapping gears.

1. Chainrings

1x 2x 3x

Chainring 1

Chainring 2

Chainring 3

Order doesn't matter — sorted automatically when calculating.

2. Rear sprockets (cassette)

Number of sprockets

Smallest sprocket (teeth)

Largest sprocket (teeth)

Rear sprocket teeth counts (comma-separated, freely editable)

Filled automatically by 'Calculate sprockets', but can be freely adjusted.

3. Wheel circumference

Tire size (ETRTO)

4. Cadence

Cadence (rpm)

Not calculated yet.

gear ratio ok overlaps another chainring extreme chainline (avoid)