Bottom Bracket Good Airtightness Waterproof Performance Better Quietness Bicycle Accessories for Mountain Bike

Feature: 1. Good Airtightness: Double silicone sealing rings are installed on the port at the bottom of the bracket to prevent pollution and prolong the service life. 2. Function: The screw system can protect frame and output more power, which is better than the ordinary structure of the bottom bracket. 3. Material: The bottom bracket shell is made of aluminum alloy, which is sturdy and durable and has a long service life. 4. Features: Compared with the traditional bottom bracket, it has higher compatibility with chain rings, better waterproof performance and quietness. 5. Good Waterproof Performance: Sealed waterproof tube T47 features blessing, better waterproof performance. Specification: Item Type:Bottom Bracket Material: Aluminum Alloy Outer Diameter: Approx. 47mm 1.9in Inner Diameter: Approx. 24mm 0.9in Bottom Bracket Shell: Approx. 86mm 3.4in,Approx.92mm 3.6in. Package List: 1 x Bottom Bracket