Taking many features from pro-level equipment this 2-piece cap-free design Tiagra chainset offers unbeatable performance2-piece cap-free design is quick and easy to install whilst being lighter and stiffer than a traditional crank/ bottom bracket assemblySG-X chainrings feature strategically placed chain pick-up pins and tooth profiles to ensure fast and positive shiftingDesigned to work with HollowTech II type bottom bracket cupsCompatible with 10-speed HG-X chainsAnodized aluminium crank armsLightweight aluminium chainrings4 arm 110 mm bolt circle diameter