The shimano mtb bottom bracket press fitbb90 has been designed for shimano hollowtech ii mtb cranks and is compatible with 895 mm with 25 mm spacer and 92 mm shells the cups are constructed with fibre reinforced polymer material this reduces any frame noise and damage the shimano set includes left and right hand cups 25 mm spacer inner cover and inner o rings being maintenance free the sealed cups keep out dirt and water the shimano mtb bottom bracket press fitbb90 has a brilliant