TEETH: 53T, CRANKARMS: 170mm, BCD: 130mm (Not include Bottom Bracket)Pedal Size: 9/16 inch. Chain Size: Standard 1/2 inch X 1/8 inch170mm crank arm length without any overlap of crank arm and chainring boltMaterial: aluminum alloy. Burly and lightweight forged crankset for ultimate strength and reliabilityFIT for: Single Speed bikes, Track Road Bike, Fixed-Gear Bicycle, Folding Bike, BYA 412 P8, P18, SP8, Dahon Folding BikeColour: BlackMaterial: aluminum alloyPackage Contents:1* 53T Bike Crankset SetOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.