Shimano FC-RS520 12 Speed Double Chainset - 50/34T - 172.5mm

- Lightweight 12-speed 2-piece design chainset
- Innovative forged and anodised aluminium crank arms for minimum flex
- The chainring teeth have been developed to work in conjunction with Hyperglide & plus 12-speed chains for increased contact to provide greater efficiency and improved power transfer
- 2-piece design bottom bracket bearings to be spaced wider apart, enabling the use of larger bearings and an increased axle diameter
- Can be used with Shimano external or press-fit bottom brackets
- The system allows for easier installation, adjustment, and maintenance
- Lightweight anodised aluminium chainrings for smooth and precise shifting