Bicycle Bottom Axle High Compatibility Waterproof Quietness Bike Bottom Brackets for Outdoor

Feature: 1. The AL7075 aluminum alloy bottom bracket shell is made of aluminum alloy, which is sturdy and durable and has a long service life. 2. Bearings provide better weight distribution and higher stability, thereby providing more efficient power transmission. 3. Compared with the traditional bottom bracket, it has higher compatibility with the chain rings, better waterproof performance and quietness. 4. Lightweight and easy to install. No need for professionals, you can also operate and install by yourself. 5. Connect your crank arm and protect the stable and long lasting power applied to your transmission system. Specification: Item Type: External Bearing Bottom Shaft Material: Aluminum Alloy Outer Diameter: Approx.47mm 1.9in Inner Diameter: Approx.29mm 1.1in Five Links: 68 73. Package List: 1 x Bicycle Bottom Axle2 x Washer