SHIMANO Shimano 105 FC-RS510 double chainset, 46 / 36T, for 135/142 mm axle, 172.5 mm, black

lightweight 2-piece design 11-speed chain set 2-piece design forged and anodized aluminium crank arms keep weight low the chaining teeth have been developed to work in conjunction with HG-X 11-speed chains for increased contact to provide greater efficiency And improved power transfer bottom bracket bearings are spaced wide apart, enabling the use of larger bearings and an increased axle diameter chain ring spacing has been optimized for use with 135/ 142 mm rear axle spacing and short chains ayes can be used with Shimano external or press-fit bottom brackets the system allows for easier installation, adjustment, and maintenance lightweight anodized sg-x aluminium chain rings for smooth and precise shifting .