Forged aluminum, Super SLR dual-pivot arm design with an enhanced arch proportion and thrust bearing for faster response (not recommended for use with older Ultegra-6600 STI systems)
Convex washer, brake pad angle system for toe-in alignment and spring tension adjustment allowing for equalized lever pressure
Resin bumper tire guide protects rim when shoes wear down
Includes Q/R, barrel adjuster, front/rear sunken nuts and R55C3 cartridge pads