The bottom bracket is made of aluminum alloy, which is strong and and has a long service life. The double silicone sealing ring can absorb the rounding tolerance and can be used to install the port at the bottom of the bracket. Prevent pollution, prolong service life and easy to install. The threaded system can protect the frame and output more power, which is the underframe of ordinary structure. Applicable: inner diameter 24MM, such as BB86, BB90, BB92 frame SHIM/ //Haomeng crankset Features: ordinary threaded tool disassembly and assembly, light weight, the frame, engineering plastic shaft sleeve seals the crankshaft axis.<br><br>Purpose: Mountain bike Model: BB86-24 Frame standard: BB86 Crankset: 24mm OD: 41mm length: 86mm Colour:Black Material:Aluminum alloy<br><br>Package Contents: 1* bike Bottom Bracket<br><br>Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.