Features: Made of aluminum alloy, super lightweight and incredibly strong. Steel shaft for added strength and corrosion resistance. Crank arm length 170mm; BCD: 104mm. Compatible with most mountain bikes. Good choice for riders who want more control on their bicycles. Specifications: Material: Aluminum alloy Shaft Material: Chromium molybdenum steel Color: Black / Red (optional) Chainring Teeth: 34T / 36T (optional) Crank Length: 170mm BCD: 104BCD Pedal Thread: M14 Crank Screw: M18 Compatible Speed: 7s - 12s Compatible Chainring: Single/Double/Triple chainring Bottom Bracket:Fit for 68/73mm BSABB Crankset Weight: Approx. 718.3g Crankset + Bottom Bracket: Approx. 818.3g Crankset + Bottom Bracket + Chainring: Approx. 867.4g Package List: 1 * Crank Arm Set (Left & Right) 1 * Bottom Bracket 1 * Chainring