The Sram Guide RS Rear Disc Brakes is precision at your fingertips, with a proven 4-piston calliper and innovative SwingLink lever technology that gives you more positive pad contact and increased braking authority. Save weight and clutter on the bar with Matchmaker. It holds Avid levers, SRAM® triggers, and various RockShox® controls, all with one tidy, light, clamp--a dream come true for handlebar component footprint conservationists the world over. Available in two versions: Matchmaker™ X integrates the RockShox®XLoc and is compatible with XX and X0 brakes. Standard Matchmaker™is also available and works with any split-clamp design and RockShox® PushLoc.  Sram Guide RS Rear Disc Brakes Features SwingLink™ lever for more positive pad engagement Tool free reach adjust for the perfect set up Powerful four piston S4 calliper with World Championship technology Bleeding Edge™ technology for easier maintenance Lever can be positioned on either side of the bar Matchmaker X compatible