Shimano TL-FC37 Bottom Bracket Tool Bottom Bracket replacement and maintenance can be one the most satisfying experiences. Many a strange creak and annoying ride noise comes from that point due to the amount of stress it must endure. Make sure to give it your bottom bracket some love. Having the right tool for the job is the only way to go about it. Features Fits Ultegra SM-BBR60 and XT BB-MT800 bottom bracket cups Does not fit standard size Shimano Hollowtech II bottom bracket cups1/2' socket drive | Shimano | Tl-Fc37 Bottom Bracket Tool Bottom Bracket Tool For Sm-Bbr660