Spurcycle C70 City/Flat Bar 70mm Mirror Seatposts The Shimano GRX BL-RX810/BR-RX810 is

The Shimano GRX BL-RX810/BR-RX810 is the front hydraulic disc brake and lever built specifically for gravel and mixed-terrain riding

Built on a 120 TPI nylon casing with Vittoria's Graphene 2

which means you can pump the lever and check for proper fluid movement without needing to install and remove the wheel repeatedly

Compatible with Shimano 7-speed cassettes and 2-speed front drivetrains

The Shimano SM-CN910-12 is the 12-speed chain quick-link (master link) for connecting and disconnecting Shimano 12-speed chains tool-free

Spurcycle C70 City/Flat Bar 70mm Mirror Seatposts The Shimano GRX BL-RX810/BR-RX810 isWhy is the Spurcycle C70 the easiest bar end mirror to use on a flat bar? The Spurcycle C70 City Flat Bar 70mm Mirror is the largest of Spurcycle's C series, and that big 70mm tempered glass lens is the whole point: it gives you the largest, easiest to read rearview of any Spurcycle mirror. A robust, rigid arm keeps the image steady and vibration free even on rough city streets and gravel, while the smooth ball and socket joint with adjustable tension