The Shimano RT79 XT brake rotor features an aluminum spider with a stainless-steel braking surface. The innovative design offers increased cooling and improved performance at a lower weight. Heat generated from braking quickly dissipates allowing for consistent powerfully braking throughout the entire ride. Paired with Ice-Tech pads, braking surface temperature can decrease from 400 to 300 degrees C, increasing all-around performance. The XT rotor also uses Shimano’s Centerlock design. Those 6 annoying tiny rotor bolts are no longer needed to attach your rotor to the wheel. A simple lock-ring secures the rotor in a matter of seconds. Centerlock rotors must be used with compatible Centerlock hubs.
Stainless steel rotor provides increased cooling and performance
Shimano Centerlock design increases strength and security
I bought the 6 bolt version of these (RT76) to pair with my new M666 SLX brakes. I was running Avid G2 Cleansweep rotors for two weeks before switching to these and the brakes seem to grab more since the switch. I didn't really pay attention to weight so I can't comment on which on wins there but they do look pretty sweet.
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