Black Nickel chrome finish Quiet and durable and features a replaceable cluster of gears 8-12 (10T-18T) Full X-SYNC for best-ever inboard and outboard shifting performance under load Splined 8,9, 10 Speed Driverbody compatible - steel Driverbody material required. 55mm chainline compatibility for more moderate chain angle, longer wear and greater precision Setup Cog for simple set up For use with T-Type drivetrains only