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Item # SHI001B

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  • One Color, 160mm ($37.79)
  • One Color, 180mm ($37.79)
  • One Color, 203mm ($41.99)
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Item # SHI001B


Functionally, XT SM-RT86 Disc Brake Rotors stop equally in comparison to Shimano's apex XTR line. That's because of Ice Tech, a shared technology on both models. The difference between the two lies in a slightly lighter XTR spider that's reserved for gram-obsessed racers.

In reality, most of us aren’t going to feel the benefits of a few grams lost when they're so centrally located to the hub. However, what we are going to profit from is the three-piece Ice Tech Rotor. It is essentially two pieces of steel optimized for friction sandwiched over an aluminum core.

This means Shimano is utilizing the high thermal conductivity of aluminum, where other manufacturers solely use steel throughout the braking surface. Additionally, the quicker cooling alloy core more efficiently transfers heat to the alloy spider. The resulting cooler operating brakes will last longer and provide more consistent stopping in the most trying conditions.

Additionally these rotors are compatible with SLX and Deore calipers if you'd like to upgrade existing brakes. Shimano's XT Ice Tech 6-Bolt Disc Brake Rotor SM-RT86 are available in three sizes -- 160, 180, and 203mm.

  • Aluminum core sandwiched between steel faceplates conducts heat away from the brake
  • 160, 180, and 203mm options
  • Six-bolt mounting

Tech Specs

steel, aluminized
Attachment Type:
160 mm 180 mm, 203 mm
Recommended Use:

Reviews & Community

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Shimano XT SM-RT86 Rotor - 6-Bolt

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Here's what others have to say...

5 5

solid rotors

  • Familiarity: I've put it through the wringer

simplicity and low maintenance are nice things to have on your mountain bike and these are that. just install and you won't have to think of them again.

5 5

Silent Rotors

  • Familiarity: I've put it through the wringer

Unless you get water on them these things are silent. Ive ridden them in every condition and could not be happier with them.

5 5

Super great

  • Familiarity: I've put it through the wringer

These are amazing, keeps the brakes nice and cool! They noticeably help with brake fade. But it is beneficial using them with xt brakes to help close off the system!

Avg. ride time: 31m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.
5 5

Ice Tech is IN

  • Familiarity: I've put it through the wringer

I wouldn't use any other rotor with my XT brakes. The heat reduction design of the calipers, brake pads, and these rotors makes the brakes work better, longer. Without a doubt, the best combination in braking.

4 5

Who says size doesn't matter!?

  • Familiarity: I've put it through the wringer

I mounted this on my Diamondback Mission 27.5. I felt the 180's that came on it were inadequate, so I upgraded the front to this 203. The difference was noticeable. The bike now stops like a nimble 26" bike. My rotor arrived not perfectly true, but once I sorted this out, it has stayed true after the bed-in process, is quiet, is effective, and looks badass! The extra stopping power of the rotor comes from the size, not so much the material. The material more pertains to the weight and heat dissipation properties. Enjoy!

5 5

Stopping power!

  • Familiarity: I've used it several times

These do what they are designed to do. Compared to the lower end rotors I had on my bike these provide much better stopping power. I also saved some weight swapping to them.

5 5

Great with XTR Brakes

  • Familiarity: I've put it through the wringer

I picked up a 203mm for the front of my Nomad and 180mm in the rear. They slow me down just fine!

Responded on

Were the rotors true right out of the box - or did they need a little straightening?

Responded on

They were extremely true - still no need to get the truing fork out to this day (about 30hrs on them)

Avg. ride time: 58m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Has anyone ever used these on avid bb7 mechanical road breaks? If so how are they?

Responded on

They will "work" while they might not give you all the benefits to say the hydrolic systems, they will be fine. With the road bike though you might be limited to 140mm rotor, check with your manufacturer.

Responded on

I just installed a pair of these 203 mm rotors on my tandem equipped with Avid BB mechanical calipers and immediately saw that the inside brake pad tabs were getting in the way. No problem: I just shortened these tabs just enough to leave a clearance of about 2 mm. Improved heat dissipation is important with tandems because of the enormous weight factor (from 300 to 500 pounds!)

5 5

I went downhill and I'm not dead...

  • Familiarity: I've put it through the wringer they must work!

I bought these to up the size on my Yeti sb95c. When those wheels get moving on the down my lever pressure was a little higher than I wanted.

I went to a 180 in the rear and 203 in the front with the metallic! What a treat!

Breaking control is amazingly controllable and I haven't gotten ANY fading even on very long descents.

They came true out of the box and were simple to install!

Do it!

5 5

Best Rotors

  • Familiarity: I've put it through the wringer

Great 2 piece design that is very stiff, quiet and quite light. Can't go wrong with these.

5 5


  • Familiarity: I've put it through the wringer

Shimano line of xt is the excellence of mid level builds, great equipment for the price!

5 5

Worth the hype

  • Gender: Male
  • Familiarity: I've put it through the wringer

While I've only used these for a few days, these rotors are amazing & worth all the hype. I recently rode both DH & Enduro at Mammoth. My XT brakes with 180mm ice tech rotors on my enduro bike worked better than the 203mm brakes on my DH bike.

Adding to my original review, these are excellent. I'm basically a giant in the world of mountain bikes (6'3" / 250lbs) and these coupled with the XT brakes on my T275 work flawlessly every time.

Do these come with a bolt kit, or do I need to buy one to mount them onto the hubs?

Best Answer Responded on

This rotor includes bolts and washers.

5 5

Best Rotors on the Market

  • Familiarity: I've put it through the wringer

I struggled with a more expensive, Italian brand and was never satsified.
These rotors are legit!

4 5

Amazing Brakes!

  • Familiarity: I've put it through the wringer

Bought these rotors to replace stock XT shimano rotors. Normally ride AM but have been running these in DH/PARK all summer long and these are amazing. After a few runs noticed that my brakes still had great modulation and were not fading like my stock brakes occasionally do! em the most. Been running them for around 6 months still look new...
Would buy again!

5 5


I upgraded to 180mm to reduce fatigue on long downhills. It's been awesome so far. My 160mm rotors were getting a rainbow discoloration from getting so hot, so I figured it might be a good time to replace them anyway. If you have 160mm rotors and want to get 180mm rotors you will also need this part:
and specify front or rear.

5 5

Single Rotor

Hello All,

I just wanted to verify for everyone interested in this item that it is a single rotor and not a pair.

Happy riding!

5 5

Best Brakes... EVER

  • Familiarity: I've put it through the wringer

True, like other AVID convertees... these are the best. You really don't know how bad your brakes are until you run these XT/XTR's. Man, never thought a bike brake could be so effortless, have so much stopping power, or be so quiet. Fantastic. 1 year now, and still flawless.

Avg. ride time: 1h 19m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.
5 5

Brakes that Work

  • Familiarity: I've used it several times

Everything that i have ever heard about XT or XTR brake has been good. Well, it is true, these brakes are by far better that the Avid 7's that i just came from.