Bike Ceramic Bottom Bracket High Strength Easy to Install Waterproof Bike Bottom Brackets for Outdoor

Feature: 1. T47 new structure has higher compatibility, better waterproof and calm performance compared with the traditional central shaft to the tooth disc. 2. AL7075 aluminum alloy shaft shell is made of aluminum alloy material, durable, long service life. 3. This bearing is easy to install. No need for professionals, you can also operate and install by yourself. 4. The built in bearing bottom bracket connects your crank arm and protects the stable and long lasting power applied to your transmission system. 5. Ceramic bearing has high strength, impact resistance, wear resistance and heat resistance, light weight and glossy, high efficiency. Specification: Item Type: Ceramic Bottom Bracket Material: Aluminum Alloy + Ceramic Outer Diameter: Approx.47mm 1.9in Inner Diameter: Approx.30mm 1.2in Bottom Bracket: 68 73mm. Package List: 1 x Bicycle Bottom Axle