To determine what size of BMX you need, you should first measure your body height and then use a BMX size calculator or a BMX frame size chart. BMX sizes are determined based on wheel size and top tube length, though top-tube length is a much more important number to consider.

BMX Bikes are generally measured in 2 ways, the size of the wheel and the length of frame. 20" is the standard BMX wheel size but there are plenty of variations out there from 12" all the way up to 26"! The second measurement is the length of the frame, and this is worked out by measuring the length of the top tube.

How to measure BMX bike size BMX bikes are typically measured using the following: User height, which also defines your racing class Wheel size, typically from 12 to 20 inches Top tube length, ranging from 19 to 22 inches Other BMX bike parts such as stem length, crank arm, and bar position

BMX bikes are measured in two ways, the size of the wheel (20” is the standard BMX Wheel size) and the length of the frame which is gauged by the top tube measurement, which we have also simplified for you into XS, Small, Medium etc categories. Below is a guide to what size you should be looking for.