Feature 1The bottom bracket is solid and durable with a long service time. 2The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom. 3Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket. 4Suitable for 80/100mm frame shell. 5Please use the BB tool to install and replace the bottom bracket for safety.SpecificationFeatures: 1. The bottom bracket is solid and durable with a long service time. 2. The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom. 3. Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket. 4. Suitable for 80/100mm frame shell. 5. Please use the BB tool to install and replace the bottom bracket for safety. Specifications: Condition: 100% New Item Type: Bicycle Bottom Bracket Material: Steel Color: Black Fitness: for 80/100mm Frame Shell Cups thread size and pitch: 34.798mm 1.37 * 24TPI Optional Style: 80*142mm, 100*155mm, 100*177mm Size: Approx. 80 * 142mm / 3.1 * 5.6inch, 100 * 155mm / 3.9 * 6.1inch, 100 * 177mm / 3.9 * 7.0inch Weight: Approx. 384g Package List: 1 * Bottom Bracket with Screws