The BB-MT801 Bottom Bracket from Shimano is for 24mm Shimano MTB cranks and uses high quality sealed bearings for exceptional performance and durability. Easy to install, this bottom bracket features sealed cups that keeps out water and muck and has a durable anodised finish. It comes complete and includes left and right hand cups, spacers, inner cover and inner O-rings.Genuine Shimano HollowTech II bottom bracket assemblySet includes left and right hand cups, spacers, inner cover, and inner O-ringsLightweight structure helps to remove vital gramsSealed cups keep out dirt and waterMaintenance freeCompatible with 68mm and 73mm shellDurable anodised finishEasy installation with TL-FC25 tool