Complete press-fit bottom bracket assembly for Shimano HollowTech II MTB cranksCups are made from fibre reinforced polymer material which reduces the risk of frame noise and damageSet includes left and right hand cups, 2.5 mm spacer, inner cover, and inner O-ringsSealed cups keep out dirt and waterMaintenance freeCompatible with 89.5 mm (with 2.5 mm spacer) and 92 mm shells41 mm cup diameterEasy press-fit installation