The press fit 41 x 89592mm 24mm spindle bottom bracket from shimano is a complete press fit bottom bracket assembly for shimano hollowtech ii mtb cranks the cups are sealed made from fibre reinforced polymer material which reduces the risk of frame noise and damage and the seal means dirt and water is kept out and grease is kept in thanks to the 25mm spacer it is supplied with it is compatible with both 895mm and 92mm shells available in black only