BMX Bike Sizing Data from the 1980's BMX Racing Video "Totally Awesome" 

Slighty Updated Because Top Tube Lengths Have Increased

Measure the Riders inseam from crotch to floor with shoes on

Gear Ratio

  • Gear Ratio = ((Wheel Diameter) x (Number of Teeth on Front Sprocket)) / (number of Teeth on Rear Sprocket)

Printable Gear Ratio Chart

Local BMX Racing Information

Greenway Cycles Inc. Gear Ratio Charts