Shimano bb71 mtb press fit bottom bracketcomplete xt level press fit bottom bracket assembly for shimano hollowtech ii mtb cranks features cups are made from fibre reinforced polymer material which reduces the risk of frame noise and damage set includes left and right hand cups 25mm spacer inner cover and inner o rings sealed cups keep out dirt and water maintenance free compatible with 89 5mm with 25mm spacer and 92mm shells 41mm cup diameter easy press fit installationa 2 year warrant