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Shimano
Dura-Ace SM-RT900 Disc Brake Rotor

Mfg PartNum:
  (15 customer reviews)
819
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Stop the cycle.

The high performance of Shimano's lightweight Dura Ace 9170 hydraulic brake calipers is thanks in no small part to their SM-RT900 Disc Brake Rotor design that has an aluminum core that lowers temperatures by up to 30°C compared to the previous RT99 design. With the jump in cooling efficiency at the rotor, Shimano has been able to decrease the weight of the entire system while upholding stellar heat management.

Centerlock mount. Available in multiple diameters.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

 

Brake Pad Type: Disc 

 

Brake Type: Disc 

140MM - Centerlock

Mfg PartNum: ISMRT900SS 

160MM - Centerlock

Mfg PartNum: ISMRT900S 

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DA is worth it-but mostly for the looks
rating
by GDS PDX
Cycling Enthusiast
Portland, Oregon

I recently had to replace my rotors. The original equipment was Ultegra, but I always thought that the black interiors of the DA's were jsut cooler looking. According to the literature, they are slightly lighting and the black brake fins disperse heat better. That may be the case, but I can't say that I really saw a performance difference. But the DA upgrade was only a few bucks more, and they do really improve the look in my opinion. Usually, I would opt for performance over looks or cost, but in this case I'll probably always stick with the DA's.

Reviewed 5/21/2020
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Numba 1 Stunna
rating
by Michael M
Portland

These are so sexy. You are guaranteed to get air when you send it in these baddies. Can also be used to cut various animal and vegan cheeses. Stay blessed.

Reviewed 7/13/2020
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Great road discs
rating
by CL
Blacksburg, VA

Truth be told, do you really need dura ace discs? Probably not but they sure look good. Braking performance seems just as good as ultegra discs but with the black finish. Definitely not disappointing and at a good price too.

Reviewed 4/4/2019
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Stopping power
rating
by Anonymous
San Diego

I find that this disc keeps it shape very well meaning that it has not bent or worp and has lasted a long time.

Reviewed 6/6/2019
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Light weight good braking surface.
rating
by Anonymous
Cycling Enthusiast
Sierra Vista, Arizona

Very good rotor. I would have preferred all black or all silver.

Reviewed 5/17/2019
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pefrect
rating
by Anonymous
3 of 3 customers found this review helpful.

Great fit. Came with lock rings. Lifht and good looking for discs.

Reviewed 12/18/2017
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Not so great...
rating
by Anonymous
Cycling Enthusiast
Midwest

I installed these on my Trek Domane carbon and they look awesome! However, they squeal, bad!! Imagine an old school bike horn every time you try to stop. I pulled a Fred Flintstone stop on a few occasions just so I don't scare a dog or a child on the trail.

Reviewed 8/4/2020
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Looks great, does the job
rating
by Riding in Chicago
Cycling Enthusiast
Chicago, Denver

How would an individual rate something like this?

Are we equiping the same bike with 6 different rotor combos and rolling the same rider down the same hill and evaluating single and repeated stopping efforts?

So the rotor looks great and does not squeal as much as the RT81 (with the same pads).

Until some outfit (Bike Radar, et. al.?) does a comprehensive test, if you want shimano, get ICE Tech and buy based on price and what aesthetic you like, bc the Ultegra version looks good as does the original RT99.

Reviewed 5/3/2019
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Good Product Good Prices!
rating
by Puntyboy
Marin County, CA

I put these on my gravel bike they work very well. They are 140 mm and I am 210 pounds and they get the job done. I have another gravel bike with the same frame and fork but a different setup. It has 160 mm rotors and of course that has more stopping power but it's a different bike for a different purpose. If you are running 140's then these are the rotors for you.

Reviewed 1/11/2020
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Full DA bike - this is just the best you can get
rating
by Anonymous

There are lighter but there none better....light, heat tolerant, and very well designed. The best.

Reviewed 12/26/2019
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The Best
rating
by Dn. Drew
East Village, Ca

Well worth every penny. These babies make it hard to get back on aero bike with rim brakes.

Reviewed 4/3/2020
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They look great, work great!
rating
by Anonymous
Competitive Racer
Middle Tennessee

These disks provide excellent stopping power and modulation. They last a long time.

Reviewed 9/24/2018
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Brakes firmly
rating
by Anonymous
Cycling Enthusiast

Black rotor combines with most colors of your bike. Installed 160 mm on the front wheel and 140 mm on the rear one. Feels very secure.

Reviewed 8/15/2019
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Best Rotor for Road Disc on the market
rating
by Anonymous
1 of 1 customers found this review helpful.

These rotors add a level of detail to my bike that no other rotor on the market can.

I am very happy with the product.

Reviewed 6/13/2018
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Best disc rotor on the market
rating
by Anonymous
Cycling Enthusiast
MD

The only rotor that doesn't squeak in the rain.

Reviewed 5/17/2019
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