Shimano XT MT801 BSA bottom bracket is the successor to the MT800 bottom bracket. This bottom bracket is suitable for Shimano Hollowtech II cranksets. In addition to Shimano XT, it can also be used with SLX and Deore. The bottom bracket is very light and has bearings that are well sealed against dirt and water. As a result, this bottom bracket will last a long time without making your bike any heavier.