Great value Deore M5100 2-piece design chainset for 10/11-speed MTB transmissions Forged crank arms rigid whilst being incredibly strong and durable HollowTech II integrated bottom bracket design uses a wide bearing placement with a large axle diameter for increased stiffness, efficiency and added durability We recommend that the bottom bracket is initially installed by a bike shop to ensure perfect facing and fit 52 mm chain line for use with 135 /142 mm O.L.D. frames 10/11-speed compatible Includes left and right arm
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