Features: Good quality bicycles straps, equipped with 5-speed flywheels and a flower drum open gear, with a diameter of 95mm and 20 hole positions, providing a smooth cycling experience. The rear wheel hub of bicycles can achieve precise braking, improve maneuverability, and pedals movement. The bicycles brake rear wheel hub is a multifunctional modification accessory that integrates the bicycles wheel hub, flywheels, and brake into one. Bicycles enthusiasts, athletes, cycling enthusiasts. Various cycling scene including cycling, mountain cycling, and road cycling. Specifications: Dimension:95mm/3.74in Component:Aluminum Alloys Axles Skin, Aluminum Shafts Center, Steel Flywheels Package Includes: Bicycles Hub Set note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.