Sram rival 22 brake caliper dual pivot design increases braking power and enhances progressive feel optimized for zipp firecrest compatibility with clearance for tires up to 28c forged aluminum arms with swissstop pad compound specifications caliper design forged aluminum arms stainless steel hardware finish grey black anodized pad swissstop pad compound technology highlights dual pivot design with convex washers optimized firecrest compatibility lever compatibility sram road shi