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ShimanoDura-Ace SM-RT900 Rotor - Centerlock


Item # SHI00E1

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  • One Color, 140 mm ($81.99)
  • One Color, 160 mm ($81.99)
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Item # SHI00E1

Dura-Ace SM-RT900 Rotor

The Shimano Dura-Ace SM-RT900 Rotor prevents brake fade on extended descents where you'd normally experience a major decrease in stopping power on the road. This Freeza Rotor is part of Shimano's newest Dura-Ace hydraulic disc brakes, meaning they're compatible with the Dura-Ace BR-R9170 caliper and Ice-Tech pads. They're compatible with frames that accommodate flat-mount disc brakes and attach to Shimano's proprietary Centerlock hub system.

The 3-layer rotor construction has a stainless steel braking surface with an alloy core featuring finned cut-outs for effective heat dispersion. Shimano claims heat is reduced by up to 50-degrees Celsius, which is significant when you're riding along mountainous terrain where sustained descents pose a threat to your stopping power.

  • FREEZA rotor reduces heat by up to 50-degrees Celsius
  • 3-layer construction dissipates heat on long descents
  • Stainless steel braking surface with aluminum core
  • Shimano Centerlock attachment with included lock ring
  • Compatible with Dura-Ace BR-R9170 disc brake caliper
  • Recommended for use with Shimano Ice-Tech brake pads

Tech Specs
Material[core] aluminum, [braking surface] stainless steel
Attachment TypeCenterlock
CompatibilityShimano Dura-Ace BR-R9170 calipers, Ice-Tech brake pads
Diameter140mm, 160mm
Recommended Useroad cycling
Manufacturer Warranty3 years

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[140mm] 96g, [160mm] 119g

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?


>Rating: 1

Two warped out of the box!!!

I've used it once or twice and have initial impressions
True to size
Size Bought

First off, I did not purchase the 160mm Dura Ace rotors from Back Country, because had I done that in the first place, I know Back Country would have provided the amazing customer service they’re known for. Instead, I purchased from another business and it has been a horrible experience in regards to the return process. That said, both rotors came out of the package warped. I had installed brand new brakes pads on my 105 brakes and they rubbed so much, the wheels barely spun. I have never had an issue with rotors like this before. I would choose something more durable such as 105 or Ultegra ice tech 🤙

>Rating: 1

Constant Warping

I've put it through the wringer

These have been the bane of my existence for the last year. I had them on 3 bikes and 6 wheelsets. They look great (bling factor), are extremely light, dissipate heat well and stop perfectly. But they warp. Bad. All the time. If you live somewhere flat maybe these will work for you but if you have to brake on a steep descent just plan on brake rub during the rest of your ride. It is really that bad. On all of my wheels. It made riding unenjoyable for cars require less maintenance than these brakes. I replaced with the MT800, problem solved.

Hey Chris. I've had similar issues with these rotors and found the caliper to be the culprit, and not the disc itself. Cleanliness and condition of pads and caliper pistons is essential to proper braking function. These discs do warp easily, but I have found that they will stay true and quiet if the pistons are retracting properly after braking. Build-up from brake pad dust and road grime around the edges of the pistons will cause them to stick, retract only partially, rub when not in use, and ruin your ride and your life. Sorry if this is info you already know, but it was a simple fix that made my rides more enjoyable. Could help... Jon

Had the same warping issue with these DA rotors. Switched to the Ultegra rotors about a year ago and have not had an issue since. Its the rotor, not the caliper. Although improper caliper function CAN contribute but that was a none factor for me which is how I know it was the rotor itself which gives your caliper zero room for error in retracting if it ever does get slightly sticky. Ultegra way better and less fuss!

Add me to the list too. I have these and the Ultegra version. I am 200lbs and constantly going down longish 15%+ grades with many twists and turns + very poor road quality (causing braking finess to go out the window). As a MTB'er I appreciate what 180mm or 200mm rotors bring to the table. I am convinced these 140mm and 160mm rotors have their limits. I may go back to XTR rotors or give the Swiss Stop rotors a try. I am running the green Swiss Stop rotors on my Dura Aces brakes and found they do a much, much better job when being pushed really hard on the decents.


Can you use this rotors with the new Shimano GRX Gravel Groupset? Would like to upgrade the stock rotors (SM-RT64). Thank you.

>Rating: 5

Stoppin' not droppin'

I've used it several times

These rotors are sweet. They have everything you need on a road bike, good looks with even better performance. I installed these on my S-Works Tarmac Disc and couldn't be happier. We live in Utah and descend a lot, they stop well, are silent and true. Highly recommend these due to form and function. Please let me know if you have questions.

Are you using the 140 or 160mm rotors?

140 front and rear. just fine for me, i weigh about 152 pounds

Ian, I have a S-Works Tarmac Disc 2015 and it's only a matter to change the rotors? The calipers and shifters are the same? Tks

>Rating: 5

Baller Status

I've put it through the wringer

Running Dura-Ace brakes? You need Dura-Ace rotors, duh! Shimano has really put emphasis on heat management at the rotor level and it is very cool to see how the technology has advanced. These new Dura Ace rotors do an excellent job of dumping heat on long descents that require lots of hard braking.

Are you using the 140 or 160mm rotors?

140mm Rear, 160mm front. If you are a super light rider, avoid long steep descents, or are a weight weenie you could do 140 Front and Rear but I opted for the added power of a 160mm front.

>Rating: 5

Awesome rotors.

I've put it through the wringer

I feel a little silly using Dura Ace rotors on an Ultegra-equipped gravel bike, but what the heck. You only live once, right? Fantastic stopping power, and the extra large fins do a great job of helping dissipate heat when braking a lot on long, steep descents.


Can I use these with a SRAM Red eTap HRD setup?

Can you? Yes. Should you? Not really. SRAM & Shimano pads are shaped differently, and thus will contact the rotors differently. You may end up with a pad that’s only 90% in contact with the rotor or which pulses under braking ... but they will work in a pinch.

Yes, they will work fine.

I tried 160mm Dura Ace ice rotors with SRAM SRAM Force CX1 Hydraulic levers and SRAM Force Post Mount Hydraulic Disc calipers. Lots of noise and pulsing. The Shimano rotor's brake track width varies around the perimeter so there's a different amount of rotor in contact with the pads at different points. Not sure if Shimano pads are that much narrower than SRAM pads or if just a bad design.

>Rating: 5

Dura ace rotors

I've used it several times

I’m not new to road bikes but I am definitely new to road disc brake bikes. I purchased these rotors because my Schramm rotors were bending therefore causing break r I purchased these rotors because my Schramm rotors were bending therefore causing break rub. After stalling these door is rotors I found I have no brick road and structurally sound and the stopping power and performance is superior to anything that I have ever experienced and wet or dry conditions I recommend these rotors to anyone