Shimano Deore XT is the original mountain bike groupset trusted by generations of mountain bikers around the world. Whatever the trail, whatever you ride, XT is your solution for mountain biking today. Reliable shifting. Superior braking. Intuitive maintenance. XT is the high performance workhorse you can count on.Key Features:Special MTB gear teeth profile improves chain engagement and retention,Hollow forged crank maximizes power transfer while limiting weight,Superior chain retention,Rigid and lightweight design for aggressive trail riding,Q-factor: 178 mm,Chainline: 55 mm.