Ready for hitting the trails, the Shimano XT BB-MT800 Press Fit Bottom Bracket is specifically designed for use with Shimano HollowTech II mountain bike (MTB) cranks. It includes left and right hand cups, 2.5mm spacer, inner cover, and inner O-rings. The Shimano XT MT800 bottom bracket features cups that are made from a fibre-reinforced polymer material, which reduces the risk of frame noise and damage. Coming kitted out with a complete XT level press-fit bottom bracket assembly, it's a perfect choice of upgrade for Shimano HollowTech II MTB cranks. Set includes left and right-hand cups, a 2.5mm spacer, an inner cover, and inner O-rings.