Sram guide rs disc brakefast isnt about pure speed its about perfect speed its about knowing the right line and having the confidence to ride it flawlessly the new 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 featuresweight 380glever material aluminumcaliper design 4 p