Optimized stopping power and modulation for cyclocross. Forged aluminum disc caliper with stainless steel backed pads and stainless hardware. Left rear brake 1800 mm hub with direct mount hardware. Specific caliper and piston ratio. Fully sealed system - no contamination. Features Brake Reach Adjust, Carbon Brake Lever, Low hand force required, Fully sealed system for no contamination, and Easy bleed access.