No more heat buildup at the rim, incredible modulation, predictable and powerful braking in wet and dry conditions the list goes on. These are the advantages of moving to a disc setup on your road machine. And so, with the introduction of SRAM's new Red 22 Hydro R hydraulics for the road braking group, a specific rotor was needed to complete the system. SRAM took the design of its AVID HSX and gave it a few tweaks for road use. What you receive is the tested design of the heat shedding HSX, in a package engineered to give you the best braking available in a road groupset. SRAM's HSX Heat Shedding Rotor was designed to seamlessly pair with the new Red 22 Hydraulic Road Disc HRD setup. The two piece stainless steel and alloy design utilizes cross drilled technology for significant weight savings without compromising durability. The new design promotes heat regulation, and shaves around 10 grams over previous AVID models. The cross drilling also sheds water quickly, resulting in increased stopping power in wet weather. Because the alloy conducts heat more efficiently, the alloy carrier on this two piece rotor allows heat to dissipate more quickly than similar one piece designs. SRAM recommends using the 160mm rotors for pavement and the 140mm size for off roadcyclocross use. SRAM has placed a 250lb riderbicycle weight limit on the 160mm rotor, recommending a bump to a 180mm if need be. The SRAM HSX Heat Shedding Rotor is available in 140mm, and 160mm sizes. It uses the IS 6 bolt mounting pattern.