The Shimano Deore FC-M5100-1 mountain bike crank delivers precise and reliable shifting for 1x10 or 1x11-speed drivetrains. The 2-piece crankset increases rigidity of crankset with less weight and transmits pedalling force efficiently. Great value Deore M5100 2-piece design chainset for 10/11-speed MTB transmissionsForged 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 fit52 mm chain line for use with 135 /142 mm O.L.D. frames10/11-speed compatible