Features: Complete XT level press-fit bottom bracket assembly for Shimano HollowTech II MTB cranks. Cups are made from fibre reinforced polymer material which reduces the risk of frame noise and damage. Set includes left and right hand cups, 2.5 mm spacer, inner cover, and inner O-rings. Sealed cups keep out dirt and water. Maintenance free. Compatible with 89.5mm (with 2.5mm spacer) and 92mm shells. 41 mm cup diameter. Easy press-fit installation.