Shimano xtr bb93 hollowtech ii bottom bracketshimano xtr is the top end model in shimano's mtb range and this bb93 bottom bracket is constructed to make sure you get the best from your drivetrain. It's easy to install and requires no maintenance, and its precision machined bearings are spaced further apart than before for increased durability and stability. This particular version is suitable for use in all 68 73mm bottom bracket shells and with its fully sealed design you don't need to worry about water or dirt getting in and affecting performance.features  bb thread type english  included left and right hand cups, spacers, inner cover, and inner o rings  compatible with 68mm and 73mm shell  compatible with all hollowtech ii chainsets  compatible with all chainsets with 24mm spindles  genuine shimano hollowtech ii bottom bracket assembly  lightweight seal structure helps to remove vital gramssealed cups keep out dirt and watermaintenance freedurable black anodised finisheasy installation  bb spindle is integrated with chainsets right crank arm  manufacturer's reference code bb93b    weight 73ga 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.