Shimano bb71 road press fit bottom bracketcomplete ultegra level press fit bottom bracket assembly for shimano hollowtech ii road 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 inner cover and inner o rings sealed cups keep out dirt and water maintenance free compatible with 86 5mm shells 41mm cup diameter easy press fit installationa 2 year warranty is offered with all shimano produc