SUNSTAR REAR SPROCKET ALUMINUM 43T-520 SUZ/YAM - 5-347243Use only the highest quality aerospace grade 7075 T6 aluminum for high strength and light weight and computer designed weight reduction holes are included for even less weight Exclusive tooth and valley design gives you 24% more chain contact area for a better transfer of power to the rear wheel and a larger area to distribute the chain impact stress resulting in a virtually indestructible sprocket A hard anodized coating is applied to provide a super