Standard BMX bikes use a 20” diameter wheel, this is the most true size to BMX, however they come in a range of sizes (12" to 24") to suit different rider heights. Kids BMX bikes use a smaller wheel size to allow for a smaller bike while maintaining that classic BMX bike feel, with race bikes all the wheels are 20” in diameter but the smaller bikes use a thinner tyre for less drag and weight savings. To help find the perfect BMX for you, take our quick and simple bike quiz.