Quieter drivetrain & less drag CNC machined 7075-T6 aluminium provides the perfect blend of lightweight & strength Compatible with 9spd, 10spd & 11spd set-ups Hard anodised finish makes them ultra durable & increases longevity Options available to suit both 96 pcd & 104 pcd 4 bolt crank set ups Weight from: 41g To fit Shimano M9000 & M8000 cranks.