The tiagra 523930 10 speed triple road chainset from shimano offers unbeatable performance with its 2 piece cap free design taking many features from pro level equipment the 2 piece cap free design is quick and easy to install but also allows it to be lighter and stiffer than a traditional crank and bottom bracket assembly the aluminium cranks are fitted with lightweight aluminium sg x chainrings which feature strategically placed chain pick up pins and tooth profiles to ensure fast and pos