Shimano XTR SM RT99 Freeza Center Lock Rotor 203mm. At Shimano, engineers stop at nothing to make the new generation of components smarter, faster, lighter, and stronger. The new XTR SM RT99 Freeza Rotors use the IceTech aluminum core clad in stainless steel, but take it a step further with the aluminum core flowing out into the center of the rotor in the form of Freeza cooling fins, a system that further discourages heat radiation. This means an incredible 150 of cooling with the RT99 rotor compared to a standard steel rotor...and throw in some finned brake pads they can further reduce heat build up by another 50. The bottom line is modulation unaffected by heat, eliminated brake fade, and fingers that stay chipper all the way down the mountain.
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