The Shimano MT510 12 Speed 52mm Chainset is an excellent value 2-piece designed 12-Speed chainset. The HollowTech II integrated bottom bracket design uses a wide bearing placement with a large axle diameter for increased stiffness, efficiency and added durability. Shimano MT510 12 Speed 52mm Chainset Features All-mountain crank set is tough and aggressive yet also lightweight Forged crank arms rigid whilst being incredibly strong and durable We recommend that the bottom bracket is initially installed by a bike shop to ensure perfect facing and fit For use with 12-speed HG MTB chains only With a 52 mm chain line for use in conjunction with 142 / 148 mm O.L.D.