Item Type: Threaded Freewheel_x000D_ Material: Steel_x000D_ Product Color: As Pictures Shown_x000D_ Product Weight: Approx. 600g / 21.2oz_x000D_ Speed: 8 speed_x000D_ Number of Teeth: 13-14-16-18-21-24-28-32T 1With smoother speed change, reduced perforation weight, and strong compatibility. 2Mainly made of high quality steel material, it has high strength, sturdiness and durability. 3It features high temperature resistance, rust prevention, no deformation, wear resistance and so on. 4High?precision tooth outline for precise positioning. Simple structure, it is easy to screw into the hub, easy installation and use. 5Suitable for mountain bikes and folding bicycles, for hybrid bike, city bike, beach crusier bike and so on.1 x FlywheelAfter the installation is complete, check whether the flywheel is locked and whether it is aligned.