BMX Size Guide

Thank you for using BMX Size Guide, the most comprehensive online BMX bike sizing guidee and chart. Find the best size BMX bike, frame, and other parts.

BMX bikes are sized in two ways, first is the wheel size, which is typically 20″. The second is the frame size, which is determined by the toptube length. The best toptube length is chosen by the riders height.

Standard BMX Bike Sizing

All standard BMX bikes use 20″ wheels, and the sizing is determined by the riders height and the frames toptube length. There are also BMX bikes with smaller wheels designed for children, as well as speciality BMX bikes with larger wheel sizes.

Height (ft)	Height (cm)	Wheel Size (in)	Frame Size (in)
4′ 8″ – 5′ 2″	142 – 157cm	20″	18.5″ – 20″
5′ 0″ – 5′ 4″	152 – 163cm	20″	20″
5′ 2″ – 5′ 6″	157 – 168cm	20″	20.25″
5′ 4″ – 5′ 8″	163 – 173cm	20″	20.5″
5′ 6″ – 6′ 0″	168 – 183cm	20″	20.75″
5′ 8″ – 6′ 2″	173 – 188cm	20″	21″
6′ +	183cm +	20″	21.25″ +

 

Children’s BMX Bike Sizing

Children’s BMX bikes use wheel sizes ranging from 12″ to 18″, and are typically ridden by ages 2 to 12 depending on their height.

Height (ft)	Height (cm)	Wheel Size (in)	Frame Size (in)
		12″
		14″
		16″
		18″

 

Specialty BMX Bike Sizing

Although not considerered a traditional BMX bike, there are BMX inspired bikes using larger wheel sizes. These may be ridden in a more casual way or for riders who can’t find a comfortable traditional BMX bike.

Height (ft)	Height (cm)	Wheel Size (in)	Frame Size (in)
		22″
		24″
		26″
		27.5″
		29″

 

Tips

If the rider is still growing, you may want to consider going up in size slightly. The exact size, fit, and feel of a bike can always be fine tuned with changing the frame, fork, handlebars, cranks, or stem. Some experienced riders may even chose a longer or shorter toptube length based on personal preference and feel. This guide is not intended for BMX racing or flatland bikes. For more details, check out the help page here.

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