Bottom Bracket Durable Long Life Protective Effect Steady Rotation Internal Bike Accessories

Feature: 1. [Durable]Al7075 aluminum alloy axle housing is made of aluminum alloy, which is durable and long service life 2. [Long Life]A double silicone sealing rings is installed at the port at the bottom of the bracket. Prevent pollution, prolong service life and easy to install 3. [Protective Effect]The screw system can protect the bike frame and output more power, which is better than the central shaft of ordinary structure 4. [Important Accessories]An important accessory of bicycle, which supports the steady operation of bicycle 5. [Steady Rotation]Easy to install, stable rotation, convenient installation and operation, and better quietness Specification: Item Type:Bottom Bracket Material: Aluminum Alloy Outer Diameter: Approx. 47mm 1.9in Inner Diameter: Approx. 29mm 1.1in Bottom Bracket Shell: Built In Approx. 86mm 3.4in, Approx.92mm 3.6mm. Package List: 1 x Bottom Bracket2 x Washer