. Compatible with Shimano, Race Face and other cranksets, the cups of this Hope MTB Stainless Steel Bottom Bracket are manufactured from machined aluminium and hold either full stainless steel or ceramic cartridge bearings Double Sealed and Fully Serviceable Bearings. These stainless steel custom bearings are double sealed, fully serviceable, and removable to provide a greater lifespan than stock units. The bearings of Hope’s MTB bottom bracket have been designed to run directly on the crankset axle, without the use of shims or spacers – again increasing life and reliability Protected Bearings. Hope uses a non-contact, free-running labyrinth seal to protect the bearing externally, and the machined aluminium centre tube is sealed internally with O-rings for superb durability Features: Material: Machined Aluminium (cups)Suitable for 68mm and 73mm shell widthInternal and External sealingWeight: 110gBuy Hope Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.