The Tiagra 50/34 10 Speed Compact 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 positive shifting. The crank is designed to work with HollowTech II type bottom bracket cups and the chainrings are optimized for use with 10-Speed HG-X chains. Available with 170mm, 172.5mm or 175mm length cranks.