If your new to BMX the first thing you will notice is that the bikes are small in comparison to other types of bicycle - It's okay they're meant to be small. BMX bikes are for jumps and tricks not long bike rides with your parents ending up at a picnic - we all know that sucks. The sizing of BMX bikes is determined by the wheel size and the frame size . The standard BMX wheel size is 20" which is good for anyone over 4'10". FAor anyone from 3 feet to 3'10" you will beed a bike with a 16" wheel and those of you between 3'10" and 4'10" you will suit a BMX with an 18" wheel. See the diagram and explanations below for the sizing of a BMX frame and how the Geometry affects the way it will ride.
1. Top tube
3. Head tube angle