Stock levers and master cylinders can be bulky, weird-looking, and just not very high-functioning. Upgrading to a more responsive master cylinder is a great way to get a little more power from your calipers, as well as upgrade the appearance at the handlebars. The racing-driven radial mount technology gets the most out of your stock or aftermarket brake caliper by increasing leverage. Compatible with OEM switch housings and CAN bus wiring, the RSD Radial Master Cylinders are available in 1-inch clamping diameter and come with a twist adjuster to easily modify the lever distance from the handlebar based on rider specs. The CNC-machined billet aluminum design is available in multiple RSD finishes and work with 9/16-inch bore for single disc and 11/16-inch bore for dual disc applications, and all mounting hardware is included.