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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.

Sizing

1. Top tube
The length of the top tube is what all BMX frames are measured by. As well as offering more room for the rider if it is longer; a longer top tube will also make the bike more stable. A shorter top tube will make your bike more responsive or twitchy.
2. Chain Stay
Essentially the length of the rear end. The shorter it is the more responsive your bike. Where as a longer one is more stable.

3. Head tube angle
Determines the angle of which your forks point towards the ground and therefore how your bike turns. The steeper the it is the quicker you turn. (The greater the angle the steeper the fork angle is i.e. a 75 degree headtube is steeper than a 74 degree headtube).
4. Seat tube angle
This doesn't vary that much and is usually 71 degrees. It affects your center of gravity . The steeper it is the shorter your bike will feel or the more forward your center of gravity and vice versa.

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