Lightweight 2-piece design 11-speed chainset 2-piece design forged & anodised aluminium crank arms keep weight low The chainring teeth have been developed to work in conjunction with HG-X 11-speed chains for increased contact to provide greater efficiency & enhanced power transfer Bottom bracket bearings are spaced wide apart, enabling the use of larger bearings & an increased axle diameter Can be used with Shimano external or press-fit bottom brackets The system allows for easier installation, adjustment, & maintenance Lightweight anodised SG-X aluminium chainrings for smooth & precise shifting