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160mm 6 bolt Ice-Tech rotor for MTB bike, 1" high Weight: about 120g/pc 180mm 6 bolt Ice-Tech rotor for MTB bike, 1.3" high, 8.2" wide Weight: about 155g/pc Ice Technology rotors reduce operating temperatures of the rotor and pads Aluminum spider combined with stainless steel brake surface over aluminum for lower weight and quicker heat dissipation Improved rotor fixing bolts and tightening plate which provides a reliable and easy to use system to keep the bolts tight against the rotor Shimano's XT Brake Rotor, sets itself apart from Shimano's lower-tier offerings through its use of an aluminum core to transfer heat away from the brake caliper This combined with the finned heat sinks in XT and XTR-level brake pads, combats heat-related brake fade That means in trail terms is consistent, reliable braking, even on long, technical descents 3-layer structure with aluminum core and two stainless steel outer layers reduces rotor surface temperature approximately 100 degrees Celsius compared to all steel rotors Cycling is a great outdoor sport for your health, the bicycle parts need to be guaranteed. We guarantee our products quality, any question in using, we are 100% responsible.