According to the BMX experts at Dan's Comp, a rider with a height of more than 5 feet, 10 inches should ride a BMX with a 20.5-inch top tube.Why do BMX bikes have smaller wheels?
Introduction: BMX bikes have small wheels that are often around 12 inches in diameter. This is because BMX racing was originally conceived as a way for kids to race on dirt tracks without having to travel very far from their homes. Smaller wheels mean less distance traveled per rotation, which means fewer rotations per minute ...How big is a full size BMX?
Bmx bikes come in a bunch of different sizes ranging from 12" all the way to 26". The most popular sizes are in the 20" range. Including 20.25", 20.5", 20.75" and 21".