Kids Bike Frame Size Results

Use this information as a starting point when shopping for a bicycle.

Rider Information

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rider height and length

BMX Bike Frame

Kids bikes are measured in centimeters regardless of the style, although some manufacturers may use inches.

Frame Measurement

This is the length of the seat tube, measured from the center of bottom bracket to top of the seat tube. Center to Top C-T: 

Frame Size icon
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Crank Sizes

Longer cranks give you more leverage, while shorter cranks allow you to pedal faster. Cranks are measured from the center of the axle to the center of the pedal hole (L).

crank sizes bicycle

Disclaimer: These bike size recommendations are for adults. Growing children should typically buy a bike with frame and crank slightly bigger than what we suggest for adults.