Bottom brackets cnc bicycle hub BB91

Bottom brackets The bottom bracket is solid and durable with a long service time. The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom. Integrated System can protect the frame, more power output, it's better than ordinary structure bottom bracket. Suitable for 68mm frame shell. Please use the BB tool to install and replace the bottom bracket for safety. Product Description  Rider's desire, continuously improving. Gineyea BB91 Bicycle Bottom Bracket Product Name GINEYEA BB91 Steel 68mm-120mm  Bicycle Bottom Brackets for Road Bike                                       Material ALUMINUM Cup+Bearing Steerer ID φ24mm*φ24mm  through Axle Application One size fits 68-12…