Fast isn’t about pure speed, it’s about perfect speed. It’s about knowing the right line and having the confidence to ride it. Flawlessly. The SRAM Guide RS is precision at your fingertips, with a proven 4-piston caliper and innovative SwingLink lever technology that gives you more positive pad contact and increased braking authority. Light, crisp, clean and now compliments your SRAM drivetrain. Go faster. Now featuring the World Championship-winning S4 caliper with Bleeding Edge and Heat Shield technologies.