Bicycle Bottom Bracket Quare Hole Axis Bike Parts for Square Tapered Spindle Crank

Features: 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 68mm frame shell. 5. Please use the BB tool to install and replace the bottom bracket for safety. Specification: Suitable: for 68mm Frame Shell Weight: about 316g 11.15oz Size: about 68 * 118 120 122.5 124.5 127.5mm Cups thread size and pitch: 34.798mm 1.37*24TPI Structure: 2 Bearings Package List: 1 * Quare Hole Axis 2 * Screws.