Shimano xt mt800 bottom bracketgenuine shimano hollowtech ii bottom bracket assembly features set includes left and right hand cups spacers inner cover and inner o rings light weight seal structure helps to remove vital grams sealed cups keep out dirt and water maintenance free compatible with 68mm and 73mm shell durable anodised finish easy installation with tl fc25 tool not includeda 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and