The Shimano FC-MT610-2 crank features an extra wide front double chainring combination (36-26T), direct mount chainrings, and a 172.9 mm Q-factor that is compatible with 135 mm and 142 mm O.L.D. frames.Great value 2-piece design 12-speed double chainsetAll-mountain crank set is tough and aggressive yet also lightweightForged crank arms rigid whilst being incredibly strong and durableHollowTech II integrated bottom bracket design uses a wide bearing placement with a large axle diameter for increased stiffness, efficiency and added durabilityWe recommend that the bottom bracket is initially installed by a bike shop to ensure perfect facing and fitDirect mount chain ringFor use with 12-speed HG MTB chains onlyWith a 48.8 mm chain line for use in conjunction with 135 / 142 mm O.L.D.