The FC-M8100-2 is a double Hollowtech II Crankset from the Shimano Deore XT Mountain biking range. It has a rigid & lightweight design built for aggressive trail riding & the Hollow forged crank maximizes power transfer while limiting weight. Available in 165mm, 170mm & 175mm. Key Features superior chain retention reducing the likelihood of chain drops Q-factor: 172mm Chainline: 48. 8mm Exchangeable single/double chainring Chain ring combination 36-26T