Tirr Sturmey-Archer SFX30 BMX 1/8" 1-speed

Rear hub freewheel for BMXTeeth (Optional): 13T OR 14T OR 15TFits chain size: 1/2" x 1/8"Driver: 3 PawlsInner Body / Outer Body Cog: Chromoly - Forged SteelScrew Cap: SteelBearing: Loose BallThread: M30 x P1.0Weight: 103 g (16T)Designed for BMX use, but may be compatible with other bike types with same thread/chain size specificationsPlease make sure your chain is correct size (1/2" x 1/8")