With its completely new, 4-piston S4 caliper, SwingLink lever cam, and carbon lever blade, the 360-gram SRAM Guide Ultimate Brakes stands alone as the new leader in its class. It has been engineered to be light and powerful, with superior heat management capabilities, which give you better, more consistent, more reliable braking. The new caliper design also incorporates a re-designed seal and aluminum piston interface for ease of setup and improved consistency, while Bleeding Edge technology makes bleeding Guide Ultimate a quick and easy task. The new SRAM CenterLine Rotor was designed to keep the center of friction consistent throughout rotation thereby minimizing vibration offering consistent performance and a quiet ride. SRAM Guide Ultimate Brakeset Features Includes - Caliper, Lever, Mounts & Rotor Redesigned 4-piston S4 caliper SwingLink lever cam & carbon lever blade CenterLine 180mm Rotor SRAM Guide Ultimate Technology Highlights Bleeding Edge - Quick and simple brake bleeding thanks to an updated fluid path and bleed porting system. Contact Point Adjustment - Pick the position you want your fingers to be in when your brakes are engaged. DOT 5.1 - Improved heat management allow flawless, fade-free performance in even more extreme conditions. Heat Shield - Stainless steel heat shield breaks the thermal connection between the pad and caliper body, reducing fluid temperature. Lever Pivot Bearings - Precision sealed bearings at the lever pivot enhance actuatuion and its consistent feel. MatchMaker and MMX Compatible - Save weight and clutter on the bar. PiggyBack Reservoir - A simple, failsafe way to manage brake fluid and also allows for ambidextrous lever placement. Reach Adjust - Easy adjustment of the lever for maximum one-finger control for everyone. SwingLink - Special cam shape to avoid that on/off brake feel, making for the perfect balance of power and precision. Timing Port Closure - Durable seals and cylinder bore finish produce dependable braking power and consistency.