Collection: BMX Cassettes & Freewheels

BMX cassettes and freewheels make up the rear side of a single-speed drivetrain, but the mounting systems are not interchangeable. Blue Groove’s range covers screw-on freewheels and replacement rear cogs for compatible cassette and single-speed hub setups across freestyle and race builds.

Start with the rear hub interface, then check tooth count, chain width and any hub-specific fitment before ordering. The live range includes both 1/8-inch and 3/32-inch cogs, plus right- and left-hand-drive freewheel options, so matching the existing hub and drivetrain matters more than simply picking the gearing you want.