5 SIZE- There are a total of 5 sizes for the square tap bottom bracket, with size of approximately 68 * 118/120/122.5/124.5/127.5mm. The cup thread size and pitch are 34.798mm and 1.37 * 24TPI. You can choose what suits you according to your own needs.
APPLICABLE- Bike bottom bracket square hole crank axis is suitable for 68mm frame shell, bearing structure, with good lubrication and stable performance, making it a good accessory for your bike.
FUNCTION- The integrated of bike square tapped spine crack bottom bracket can protect the frame and provide higher output power, which is superior to the bottom bracket of ordinary structures. The steel shell can absorb the roundness tolerance of the installation port at the bottom of the bracket.
ATTENTION- For safety reasons, please use the BB tool to install and replace the bottom bracket for the installation of the square taped spine crank, as this is safer for you.
GOOD QUALITY- The mountain bike center shaft is made of good materials, which are very sturdy, have good performance, high strength, long service life, and can be used for a long time.