The Shimano FC-A073 crankset is compatible with 3x7 and 3x8 drivetrains and provides wide range 50-39-30T gearing with a chain guard. It uses a square taper bottom bracket interface and is available in 165 and 170mm crankarm lengths. Shimano FC-A073 Square Taper Triple Chainset 7-/8-Speed Great value Tourney road chainset SG-X chainrings feature strategically placed chain pick-up pins and tooth profiles to ensure fast and positive shifting Designed to fit square tapered bottom bracket spindle Compatible with 7/8-speed Shimano chains Lightweight aluminium crank arms Hard-wearing steel chainrings