Bielas BMX

Most BMX crank sizes are compatible across bikes, but there are important considerations depending on your needs. When replacing cranks on a kids BMX bike, it's best to measure the current crank length and choose within a 10mm range. For full-size BMX bikes, crank length is a matter of personal preference; standard lengths range from 160mm to 180mm, suitable for various riding styles. Some street riders, particularly those using rear pegs, prefer shorter cranks to enhance heel-to-peg clearance. Explore our drivetrain buyer's guide for assistance in choosing the right cranks.

Longer BMX cranks do not necessarily increase speed. While crank length affects the gearing you have over your BMX bike, it does not directly correlate with speed. The gear ratio of the bike has the most impact and is a trade off bewteen acceleration and top speed.

To increase the speed of your BMX crank, consider optimizing your gear ratio. The standard gearing for full-size Freestyle BMX bikes is 25t - 9t, but there are other popular combinations available to suit your BMX bike. Need help understanding BMX drivetrain parts? Check out our handy drivetrain guide designed to enhance your knowledge of BMX cranks.

Choosing the right crank arm length for BMX racing depends significantly on rider height. Crank size affects the bike's performance and handling; longer cranks offer increased leverage and power potential but may be harder to pedal swiftly. Many BMX riders prefer shorter cranks for their ability to facilitate quicker pedal strokes, despite potential trade-offs in power and stability.