Teeth 48T Crank Arm 170mm BCD 130mm Not include Bottom Bracket Pedal Size 916 Chain Size suitable for 12 X 18 single speed chains doesnt support any variable speed chains 170mm crank arm length without any overlap of crank arm and chainring bolt Material aluminum alloy 7075T6 Burly and lightweight forged crankset for ultimate strength and reliability Fit for Single Speed Bikes Track Road Bike FixedGear Bike etc