Join Date: Jul 2003
Location: Norfolk, England
Bikes: Orbea Enol roadie, Fly Micromachine BMX, Fort Track fixed
Wheels are generally 20 inches (outer tyre diameter), but there are 24 inch BMXs available (racers, not really freestyle). Frame size is pretty much what Sloth said; the size you go for depends one what you want it for. Flatland frames are generally smaller than street/park and race frames. I'm no expert when it comes to racing, but I'd guess that racing frame size is more dependant on body size than anything else. Anyway, a good starting point, for freestyle at least, is 20.5-21 inches, especially if you don't know what type of riding you want to do (I started with a 21 inch bike, but now ride an 18.75 flatland bike).