Integrated design, fine craftsmanship, beautiful appearance. A good and wise choice you should make.Accurate sensibility provides an unmatched transition between gears when up and down shifting.The flywheel is made of high-quality aluminum alloy material, rust-proof, strong, and can be used for a long time.The 12-speed flywheel can increase the riding speed without generating noise. Wear resistance, lower noise, stable rotation.Easy to install and remove, without any professional requirements even though you are an amateur.Specification:Item Type: FlywheelMaterial: Aluminum AlloyWeight: Approx. 702g / ozQuantity: 1PCSpecification: 12-Speed 9-50TNumber of Teeth: 9-11-13-15-18-21-24-28-32-36-42-50TPackage List:1 x FlywheelNote:After the installation is complete, check whether the flywheel is locked and whether it is aligned.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.