Features: Aluminum alloy construction is solid, incredibly strong and lightweight. CNC machining improves the strength and rigidity. Hollow-out design for reduced weight without sacrificing the strength. Threaded bottom bracket, with good sealing and low noise. Bottom Bracket Width: 68-73mm. BCD: 130mm. Crank Arm Length: 170mm. Great replacement parts for folding bikes. Specifications: Material: Aluminum alloy Chainring: 53T / 56T / 58T (optional) BCD: 130mm Crank Length: 170mm Spindle: 115mm Bottom Bracket Width: 68-73mm Crank Weight: Approx. 473g Total Weight: Approx. 1300g Package List: 1 * Crank Arm Set 1 * Chainring 1 * Bottom Bracket 5 * Bolts 1 * Crank Screw 1 * Crankset Bolt Allen Wrench