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  • Shimano XTR SM-RT99 CenterLock Disc Rotor
  • Shimano XTR SM-RT99 CenterLock Disc Rotor Detail
  • Shimano XTR SM-RT99 CenterLock Disc Rotor 3/4 Front
  • Shimano XTR SM-RT99 CenterLock Disc Rotor Detail
  • Shimano XTR SM-RT99 CenterLock Disc Rotor Detail
  • Shimano XTR SM-RT99 CenterLock Disc Rotor Detail
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ShimanoXTR SM-RT99 CenterLock Disc Rotor

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Item # SHI0666

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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
Tech Specs
Attachment Type
CenterLock hubs
160 mm, 180 mm, 203 mm
Recommended Use
mountain bike
Manufacturer Warranty
3 years

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Consistent and constant braking power

    I added these to my carbon hardtail that has been used recently as a gravel grinder. The decents are 1500 vertical ft, at my 220lbs the braking has not faded or pulsate. Highly recommend them!

    The Best !

    • Familiarity: I've put it through the wringer

    They come laser straight and they stay that way. Much better than the Sram centerline x that I replaced. Also, the Shimano 160 mm rotors weigh 115g. Sram weight 120g and warp with easy use.

    Great Rotor!

    • Familiarity: I gave it as a gift but have feedback to share

    Bought this for my brother's birthday, and he just won't shut up about it. He really enjoys the upgrade, and has put 500 miles and counting on these things.

    Are these rotors compatible with sram flat mount caliper?

    Hey Charles,

    They will, however I always suggest keeping the rotor and caliper the same company. If you need a centerlock rotor, then I would suggest these:

    ultra light and fast cooling

    • Familiarity: I've put it through the wringer

    the extra surface area help with cooling a lot. ultra light for a centerlock setup.

    Shimano is king for MTB brakes

    • Familiarity: I've put it through the wringer

    Love Shimano brakes on my MTB's, even with SRAM drive trains. Love the simplicity of centerlocks and these are super durable without being too heavy.

    Looks, stopping power, cooling!!

    • Familiarity: I've put it through the wringer

    These things stay cool when clamping hard and really flexing their stopping power. They stay cooler than any other rotors i've ever ran. They also look awesome with the cooling fins and sweet cut outs. Need i explain how well they stop? they stop on a dime. well worth the price.
    Wish they came in a 6 bolt but oh well.

    Very Noisy

    • Familiarity: I've used it several times

    I got these originally for a new set of wheels I bought for my GT Grade bike. Although I broke them in very meticulously as described in the instructions, they squealed every time I applied them. Although they stopped the bike, the squealing was obnoxious, so I called Competitive Cyclist to see if there was something I could do. He suggested that I send them back and get them replaced with the same rotor. I had them replaced and I have the same obnoxious squeal every time I apply them. I have had several other bikes with disk brakes and have never experienced this with any of them, and by the way, I never had to go through a ridiculous break-in procedure. I debated giving them a two star. BTW, I had new pads on when put the second set of rotors on.

    All you need

    • Familiarity: I've put it through the wringer

    All the stopping power you will ever need. I used these for steep downhills and have yet to heat them up enough to compromise performance

    Much straighter and stronger than 6 bolt

      My 6-bolt rotors would almost always be wavy right out of the box. The centerlock rotor is straighter and seems to be stronger since I've yet to bend one or even have it become wavy

      True dat!

      • Familiarity: I've used it several times

      I was apprehensive at first to go away from 6 bolt but I was surprised by how true these were. Stopping power is about the same.

      Best rotor for Centerlock

        If you have centerlock and want the best rotor out there, here it is.....Really wish they'd make a 6 bolt version of it though.

        When in doubt, XTR

        • Familiarity: I've put it through the wringer

        Serious bit of tech. Feather light, looks the business, and the highest performance. I dont think i push these rotors hard enough to test the cooling, but they certainly have plenty of bite all the way down my steepest DH segments.

        Do not recommend with sram brakes

        • Familiarity: I've put it through the wringer

        These work great with Shimano calipers as intended; the regular Centerline and Centerline X do fine as well, but I experienced a catching sensation with these rotors and SRAM Force calipers, presumably due to the larger pad area grabbing the rotor arms each revolution. This contributed to some accelerated pad wear and imprecise braking.

        Though you'll see plenty of people running the setup, I do not recommend it. There are plenty of other combinations you can ride that won't wear your pads unnecessarily fast.

        No Slowing Down A Vintage Cerwin Vega

        • Familiarity: I've used it once or twice and have initial impressions

        The SHIMANO XTR SM-RT99 CENTERLOCK DISC ROTOR works perfectly for my vintage Cerwin Vega AT-15. Normally I would use this smaller rotor on the rear wheel but this time I used it to help make the modern high frequency driver fit on the vintage cabinet. The vintage driver was slightly larger in diameter. It looks so good I am surprised Cerwin Vega isn't using shimano xtr components. It did take some minor modifications like drilling out the rivets in the rotor to remove the center lock piece. And, the HF driver needed some sawing on the asymmetrical mounting bracket on the back to fit. But even though this is not it's intended install, it fit with less than a mm of tolerance. Check out the photo of my updated and highly modified Cerwin Vegas I brought back from Arkansas from a dear friend.
        Shimano Components are found in a lot of products, now even speakers. I am taking my vintage Cerwin Vega on a ride through the rock gardens and Classic rock rocks on shimano!

        No Slowing Down A Vintage Cerwin Vega

        Light, 12 mm locking included

        • Familiarity: I've used it several times

        160 mm is 115 g and lockring included. Light and easy to mount. The lockings work for 12 mm through axles but not for 15mm in the front. Needs a different locking! Comp Cyclist should start to stock these!
        Good brake modulation, I use these with XTR race brakes and there is no lack in stopping power.

        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