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📐 Frame size calculator

Experimental estimate. The formula is not calibrated on real riders — use the range as a starting point and always test-ride.

How to measure

Barefoot, against a wall, with a helper. Shin: floor to knee joint; thigh: knee to hip bone; torso: hip bone to shoulder joint; arm: shoulder joint to the centre of a clenched fist. Measure twice.

What it calculates

From your height and limb lengths it suggests a frame reach and stack range (top tube length in inches for BMX) and lists matching frames from the catalogue.

This is guidance only: stem, bar, spacers and riding style matter as much.