The Shimano Deore FC-M6100-1 crank features an entirely new construction, using direct mount chainrings, special gear tooth profile for improved chain retention, and a 181 mm Q-factor that is compatible with 157 mm O.L.D. frames.Superior chain retention for smoother riding even over rough terrainDynamic Chain Engagement+ improves chain engagement and retentionMore manoeuvrability and aggressive riding realisedFor extra wide 157 mm O.L.D. and 56.5 mm chainlineDirect mount chainringGreat value Deore M6130 2-piece design chainset for 12-speed Dyna-Sys MTB HG-X 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 durabilityLightweight aluminium chainringWe recommend that the bottom bracket is initially installed by a bike shop to ensure perfect facing and fit56.5 mm chain line for use with 157 mm O.L.D. frames12-spee