2-piece design triple-ring 9-speed chainset from the excellent value Sora range with SG-X chainrings feature strategically placed chain pick-up pins & tooth profiles to ensure fast & positive shifting. 2-piece design allows the bottom bracket bearings to be spaced wider apart (outboard the frame) enabling the use of larger bearings & an increased axle diameter There is also the benefit of easier installation, adjustment & maintenance Compatible with Hyperglide (HG) chains Aluminium crank arms Aluminium outer chainring with hard-wearing steel inner chainring Compatible with 9-speed drivetrains 130 mm bolt circle diameter