The shimano road press fit bottom bracket with inner cover for 865 mm is a complete press fit bottom bracket assembly for shimano hollowtech ii road cranks the cups are made from fibre reinforced polymer material which reduces the risk of frame noise and damage this bottom bracket cover set includes left and right hand cups inner cover and inner o rings the sealed cups keep out dirt and water and this product is maintenance free and compatible with 865 mm shells with a 41 mm cup diameter