Bicycle Ceramic Bottom Bracket Stable Waterproof Quietness Bike Ceramic Bottom Axle for Cycling

Feature: 1. No need for professionals, you can also operate and install by yourself.Lightweight and easy to install. 2. Connect your crank arm and protect the stable and long lasting power applied to your transmission system. 3. Compared with the traditional structure, the bottom bracket has higher compatibility with the chainring, waterproof performance and quietness. 4. Made of ceramic bearings, high strength, impact resistance, wear resistance and heat resistance, light weight and glossy, high efficiency. 5. The bicycle bottom bracket shell is made of aluminum alloy, which is sturdy and durable and has a long service life. Specification: Item Type: Built in Bearing Bottom Shaft Material: Aluminum Alloy+Ceramics Outer Diameter: Approx.47mm 1.9in Inner Diameter: Approx.30mm 1.2in Five Links: Approx.86.5mm 3.4in . Package List: 1 x Bicycle Bottom Axle