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Item # SHI0666

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  • SM-RT99, 160mm ($49.97)
  • SM-RT99, 180mm ($54.95)
  • SM-RT99, 203mm ($59.95)
  • SM-RT99, 140mm ($66.99)
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Item # SHI0666

The next generation of perfection.

Nobody puts more thought into brake rotors than Shimano, and the SM-RT99 XTR Race CenterLock Disc Rotor is proof of that. The hybrid steel and aluminum construction saves weight and manages heat buildup. Even better, it's been topped off by Shimano's lightweight and user-friendly CenterLock hub/rotor interface.

While it's awash in complex Japanese tech, the rotor's main job is still a simple one: to scrub speed. That makes the braking surface the most important part, and it's shiniest highlight is Shimano's IceTech construction, which involves bonding two stainless steel braking tracks to an aluminum inner-core in a speed-scrubbing sandwich.

Although this bond is exposed to a great deal of heat and friction, we've yet to experience any separation of the layers over hundreds of hours of ride time—even for gravity sessions—and the benefits are well worth the non-risk. Not only does IceTech result in a lighter weight rotor, but the aluminum core sheds heat faster than a standard steel rotor. By reducing heat buildup in the brake system, your brakes provide more consistent power while simultaneously reducing the risk of boiling the brake fluid.

Shimano's obsessive attention to detail is also immediately visible when looking at the alloy cooling fins. Those wavy inserts on the inner-diameter of the braking track aren't just for show. In fact, they're the latest evolution of IceTech construction. The fins channel heat away from the braking track, which dissipates heat into the air instead of channeling it back into your brake caliper. This equates to even more effective heat management than the previous generation, the SM-RT98 XTR IceTech rotor.

To keep the weight to a minimum, Shimano attaches the braking surface to an aluminum spider. And since those grams add up, the spider attaches to the hub via Shimano's CenterLock rotor mount standard. This attachment method saves weight over a six-bolt hub and rotor, and it has the added benefit of making rotor-swaps much quicker.

Please note that these rotors will only work with CenterLock hubs, and they cannot be adapted to six-bolt hubs. If you need a Shimano IceTech rotor for six-bolt hubs, consider the SH-RT86 XT IceTech rotor.

  • A top-tier disc rotor for unrivaled stopping power
  • IceTech construction manages heat to maintain responsiveness
  • Cooling fins scrub heat while scrubbing speed
  • Temper's XTR speed with equally impressive braking

Tech Specs

Attachment Type:
CenterLock hubs
160 mm, 180 mm, 203 mm
Recommended Use:
mountain bike
Manufacturer Warranty:
3 years
Actual Weight:
SM-RT99, 203mm: 171g

Reviews & Community


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Light, Quiet

  • Familiarity: I've put it through the wringer

super lightweight, quiet while braking - even in wet conditions. I use with a non-XTR brake set - just SLX level - and they work just fine.


  • Familiarity: I've used it several times

These are centerlock only rotors. Must have center lock hubs to run these rotors. The freeza technology mix with ice tech really keeps the heat down and braking power consistent. Help to not burn up rotors after a long descent.

Stop on a Dime

  • Familiarity: I've put it through the wringer

I put these on my Ibis Mojo 3 and have the Ibis 742 wheelset - you'll need hubs with centerlock. I wanted an aggressive short travel bike and bought a 203mm in front & a 180mm rotor in rear.


- Lightweight

- Cools fast

- Stopping power is next to none

- Easy to install and remove if need be, considerably easier than dealing with 6 bolt rotors


- the 15mm (or 20mm) lockring does not come with the rotor. And like Geoff T noted below, they're a bit of a hassle to find. That said if you're lucky enough to have a good local bike shop, they're likely to have one.

The bottom line is you can't beat these rotors. They're light and work great if you've got hubs with centerlock.

Stop on a Dime
Avg. ride time: 2h 12m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Creme de la Creme

  • Familiarity: I've put it through the wringer

To use these, you must have Centerlock hubs! If you do, look no further for a rotor! These are light, durable and cool extremely well. I highly recommend them.

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

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