2-piece design double-ring 9-speed chainset from the excellent value Sora rangeSG-X chainrings feature strategically placed chain pick-up pins and tooth profiles to ensure fast and positive shifting,2-piece design allows the bottom bracket bearings to be spaced wider apart (outboard the frame) or press fit 86.5mm enabling the use of larger bearings and an increased axle diameter,There is also the benefit of easier installation, adjustment and maintenance,Compatible with Hyperglide (HG) chains,Aluminium crank arms,Aluminium outer chainring with hard-wearing steel inner chainring,Compatible with 9-speed drivetrains.