Shimano xt mt800 mtb bottom bracketprecisely machined and with fully sealed cups, this shimano xt level bottom bracket is the ideal choice for use in your mtb or road bike's hollowtech ii system. Its advanced design gives you maintenance free operation and consistently smooth performance.features set includes left and right hand cups, spacers, inner cover, and inner o rings lightweight seal structure helps to remove vital grams sealed cups keep out dirt and water maintenance free compatible with 68mm and 73mm bottom bracket shells compatible with all shimano hollowtech ii chainsets durable anodised finish easy installation with tl fc25 tool available separately manufacturer reference number bbmt800b weight 82g approxa 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.