Features1[Smooth Operation] Can run smoothly, rotate smoothly, step on labor saving, easy to install and operate. 2[Material] Made of high quality materials, the sprocket crankset is durable, lightweight, strong and has a long service life. 3[Accuracy Cutting] Using accuracy cutting to ensure a fit to the bicycle, and compatible with many bicycle models. 4[Anodized Treatment] The sprocket crankset is anodized, which is a good substitute for bicycle maintenance. 5[Anti Deformation] Adopting sophisticated forging technology, the sprocket crankset is highly resistant to deformation.SpecificationItem Type: Sprocket CranksetMaterial: Aluminum AlloyCrank Center: Approx. 170mm / 6.7in (the Distance Between the Centers of the Two Holes)50/34T Full Length: Approx. 300mm / 11.8in53/39T Full Length: Approx. 305mm / 12.0inProduct Size: Leg Length: Approx. 215mm / 8.5inShaft Diameter: Approx. 23mm / 1.0inCentre Shaft Length: Approx. 9.3cm / 3.7inApplication: Suitable for Round Bottom Shaft, Pay Attention to the Shape of the Crank of the Original Car when BuyingPackage List1 x Crank1 x Crankset2 x Accessories1 xCentreShaft2 x Washers