Features: Craft from quality aluminum alloys and steel materials, the bicycles rear hub is engineered to withstanding the harsh test of daily ridings. Elevates your cycling performances with the bicycles rear hub, a mountain bike disc brake hub designs for seamless speed transitioning and durability. Features a firm structure with 4 bearing and a 9T single speed freewheel, this 85mm, 20 hole bike hub ensures good power transfer. Whether tackling city street or mountain trail, this bicycles wheel part provide the stability and control needing for various ridings experiences. Great for cycling enthusiasts and professional cyclists who demand precisions and efficiency in their single speed setups. Specifications: Materials: Aluminum Alloys, Steel Color: As The Picture Shows Package Weight: approx.273g Size: approx.85mm/3.34in Package Includes: 1Pc Bicycles Rear Hub note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!