The Essor USA Aerodash Crankset is designed with both strength and aerodynamics in mind. The stiff 7075 aluminum composition ensures maximum power transfer, while the seamless construction promotes smooth airflow over the crank. With a 144 BCD, this crank is perfect for those wanting to swap chainrings to customize their gearing. [FEATURES] TOOTH COUNT: 48 CHAINRING BCD: 144 CRANK ARM LENGTH: 170mm WEIGHT: ? ?908g Bottom Bracket INCLUDED (BSA - 68mm / 1.370/1.375? x 24 TPI threads) Chainline: 43.5 Q-Factor: 137 Risk-Free Purchase - State Bicycle Co. offers FREE EXCHANGES* -If this item doesn't work out, we'll send you a return label and exchange for free!