Governed by the Rules

BMX race rules allow a wheel to be sized from basically 12 inches, up to just a tad under 22 inches in diameter (termed “over-sized”), but most bikes are your standard 20 inch wheel which resembles the majority of bikes in the freestyle world. What changes on smaller BMX race bikes are the frame sizes, rim/tyre combo, and parts being scaled down to fit smaller bodies. Parts like handlebars, stems and cranks sizes. Subsequently, the weight of a bike comes down as you scale down the various parts. More on the importance of this later. The exception here is the cruiser class, where wheel size is 24 inches (up to a maximum of 26 inches)