CYSKY Single Speed Crankset Set 56T 170mm Crankarms 130 BCD Litepro Folding Bike Crankset with Protective Cover for Single Speed Bike, Track RoadFeatures Teeth: 56T, Crankarms: 170mm, BCD: 130mm (Not include Bottom Bracket) Pedal Size: 9 16". Chain Size: Standard 1 2" X 1 8" All new crank arm designmuch stronger for faster and more aggressive riding 170mm crank arm length without any overlap of crank arm and chainring bolt Material: aluminum alloy 7075 T6. Burly and lightweight forged crankset for ultimate strength and reliability FIT for: Single Speed bikes, Track Road Bike, Fixed Gear