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Ice cold.

Heat buildup is the mortal enemy of disc brake systems, and Shimano has pulled out all the stops with the XTR SM-RT99 CenterLock Rotor to keep the brake calipers cool. Its IceTech technology utilizes an aluminum core sandwiched between stainless steel braking tracks, resulting in a lighter rotor that sheds heat faster than standard all-steel rotors. Additionally, the wavy alloy inserts on the inside of the braking track serve as cooling fans to channel heat away instead of into the brake caliper. All this attention to heat dissipation boils down to more consistent braking power and more confidence on the trails than you'd have with non-IceTech rotors.

Please note that the XTR SM-RT99 rotors are only compatible with CenterLock hubs, and they cannot be adapted to six-bolt hubs. If you need a Shimano IceTech rotor for six-bolt hubs, check out the SH-RT86 XT IceTech rotor.

  • IceTech construction
  • Aluminum spider
  • Compatible with Shimano CenterLock hubs

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Here's what others have to say...

Is the rt99 180mm heavier than rt98 180mm rotors?

Manufacturer weights show the RT99 as 130g vs. 122g for the RT98. However, you would experience drastic performance advantages by improved heat management on the RT99s aluminum fins


part needed for thru-axles

  • Familiarity:I've put it through the wringer

You need a SM-HB20 lock ring to use these rotors with a 15/20mm oversized axle. These are hard to find.


best of the best

  • Familiarity:I've used it several times

I had the icetech rt86 rotors that wouldn't stop squealing so when I upgraded my pads (truckerco semi-metallic organic) I switched out the rotors too the new rt99 and they are awesome. new setup doesn't make a sound and stopping power is definitely better. cant tell if its the pads or the rotors or both, but I like the upgrade to say the least

Unanswered Question

I want to know the distance of two bolt(opposite side) at inner side of disc. Size of disc is 203mm

What does the 160mm SM-RT99 weigh?

What does the 160mm SM-RT99 weigh?