The shimano deore xt fc m8000 11 speed chainset is a performance mountain bike chainset designed to maximise your efficiency and ensure you39re shifting smoothly there are loads of different variations so you can fine tune your ride and each one is available in different lengths to suit you all the chainsets have forged hollowtech i ialuminium cranks for the best possible strength to weight ratio and the external super smooth bottom bracket bearings ensure you39re efficient the t