This 2-piece cap-free design Tiagra level 9-speed compact chainset offers unbeatable performance, sporting many features from the pro-level equipment, this allows a quick and easy installation whilst delivering a lighter feel compared to the traditional crank/bottom bracket assembly. If you need quick and positive shifting, then the SG-X chainrings with its pick-up pins and tooth profiles will be right up your street - with other benefits. Anyone using this chainset will instantly benefit from quieter running as well as a smoother shifting directional chain - bringing an improved power that is worthy of the Tiagra standard.