The most popular sizes are in the 20 range.
Bmx bike sizes.
Most bmx bikes have 20 tires while the larger frames may use 24 tires also known as cruiser class bmx bikes.
Bmx bike frame sizing is generally measured in inches in.
As a minimum you will need at least a 23 inside leg to be able to stand over a full size bmx bike.
When figuring out frame size only the rider s height is important.
Height ft in cm top tube in crank size mm 4 122.
Racing bmx bikes are lightweight designed for speed and stability while freestyle bmx bikes are sturdier with thicker frames and tires designed for maneuverability while doing jumps and tricks.
The correct fit for a flat 20inch bmx bike would be a rider that stands 155 cm.