Bmx bike frame sizing is generally measured in inches in.
Bmx bike sizes.
Over the years this frame has been made in a variety of sizes ranging from 19 8 21 75inches with variations to the chainstays head tube angles and seat tube angles the 20inch bmx frame has been through a lot however one thing has remained the same the riders.
The correct fit for a flat 20inch bmx bike would be a rider that stands 155 cm.
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.
Including 20 25 20 5 20 75 and 21.
Most bmx bikes have 20 tires while the larger frames may use 24 tires also known as cruiser class bmx bikes.
When figuring out frame size only the rider s height is important.
Height ft in cm top tube in crank size mm 4 122.