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Shimano XT RT81 Icetech Centerlock Rotor

Item #: BR247L00
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Shimano XT RT81 Icetech Centerlock Rotor

Shimano XT RT81 Ice-Tech Centerlock Rotor

Shimano’s RT81 rotors embody Shimano's signature Ice-Tech Technology. Ice-Tech produces 25% more braking power through achieving a high system stiffness and incredible cooling power. The 3 layer rotor features an aluminum core between stainless steel outer plates. This configuation quickly and efficiently dissipates heat from the exterior, drawing it away to cool into the atmosphere using the aluminum carriers and cutout winged design. With better heat dissipation, there is more consistent braking power.

  • Centerlock Rotors mount on Centerlock hubs only (SM-RT96 lockring for QR and 12mm hubs included, HB20 lockring is required for 15mm and 20mm thru-axle hubs, sold separately). Will not fit on standard 6-bolt hubs.
  • Floating arrangement delivers excellent stiffness properties, low weight, great brake feel and incredible heat dissipation
  • Ice-Tech heat-shedding technology ensures consistent, predictable braking.
  •  Mud- Shedding Design is ready for the roughest conditions
4.7 / 5.0
59 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
44
11
4
0
0
Great Expensive Rotors
Been using the Shimano RT64 SLX rotors with SLX brakes for this past summer and braking was fine. The Ice-Techs are true out of the box, great stopping power and better modulation. Highly recommend them if money is not an issue. They work with allmodern Shimano brakes, M615 Deore, M675 SLX, M785 XT, XTR, ZEE.People also installed them with Avid and Hayes brakes.

PROS: Lightweight, Great Stopping Power, Easy To Install, Sturdy Design
November 25, 2014
Location:
Toronto, ON
Stopping Power
Good rotors, good price. 180mm rotors just fit on my Turner bike and provide excellent stopping power for this Clydesdale rider! :)

PROS: Handles Elements Well, Sturdy Design, Easy To Install, Great Stopping Power
July 31, 2014
Location:
Redlands, CA
Shimano brakes = pure bliss
Theres not much to say about shimano brakes except they rule. To get the benefits of this rotor you need shimano brakes with ice tech pads. When paired these discs are powerful,fade free, and quiet as a mouse in all conditions in any scenario. Gave 4 star cuz i havent tried the RT99 rotors.

PROS: Easy To Install, Fade- Free, Handles Elements Well, Great Stopping Power

BEST USES: Dh, Aggressive Trail, Mountain Biking
October 22, 2014
Location:
Riverside, Ca
love it dont bend like the 6 bolt
it comes with matching black centerlock

PROS: Great Stopping Power, Sturdy Design, Lightweight, Easy To Install

BEST USES: Wet Conditions, Road Biking, Mountain Biking
November 25, 2015
Location:
canton ohio
Solid rotor
Good power, less fade with prolonged braking. Would have given it 5 stars if they would have included the lockring for 15/20 thru axles.
December 30, 2016
Location:
Texas
Great product, but they should all come with the externally splined locknut.
I don't even understand why there needs to be two different designs for the locking nut on these, but maybe someone will enlighten me. The only reason this didn't get 5 stars is because it came with the internally splined lock-nut which doesn't work with a 15 mm front thru axle (at least not with any of the tools I've seen). I had to pay $10 extra per axle to get the externally splined lock nut that would allow me to install it on the front, and use a common tool for both front and rear. (it was either that or start grinding away at one of my cassette tools).
May 9, 2017
Purchased
5 months ago
Location:
San Diego
Make sure to get separate lockrings if using 15-20mm axle
The rotors work great, and the 203mm rotors deliver noticeably better stopping power than my 180s. They come with lockrings, which can be installed with a cassette tool; however, the supplied lockrings will not fit over 15-20mm axles. Shimano offers lockrings for larger axles, but they must be purchased separately and installed with a bottom bracket tool.

PROS: Great Stopping Power, Lightweight, Sturdy Design
August 16, 2016
Location:
Burlington, VT
Rotor
smooth braking, rotor runs true and flat. Great stopping power when descending Mt. Mitchell!
May 2, 2017
Purchased
10 months ago
It's a centerlock (which are awesome to install) rotor. And it doesn't squeek like some other brands.
October 5, 2017
Purchased
1 month ago
Great discs!
Easy install, stops on a dime. Shimano got it right using the same tool to mount a cassette for mounting the disc.
February 27, 2017
Purchased
8 months ago
Location:
Baton Rouge, LA

Q & A

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Browse 7 questions Browse 7 questions and 19 answers
Will these rotors work with a 15mm frnt. axle and 12x142 rear axle?
Sean on Apr 16, 2016
With this rotor fit the XTR M988 Trail MTB Disc Wheelset? The wheelset is 15mm from and normal skewer in the back. if so with they fit as is or will they need an different lockring?
Daniel F on Feb 13, 2017
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BEST ANSWER: Yes this rotor fits Shimano centerlock hubs. The lockring that comes with this rotor will fit the rear hub. The 15mm front hub will need the locking that uses the external bottom bracket tool to install; the Shimano HB-20 one. The type of lockring that uses the cassette tool to install will not fit over the axle.
Do these come with the Lock Ring for a 15mm hub?
t on Aug 10, 2016
BEST ANSWER: A lockring is included, but it will not fit a 15mm hub. You will need to purchase the HB20 lockring.
Shimano HB20 15/20mm Rotor Lockring
Shimano HB20 15/20mm Rotor Lockring
would this rotor work with an avid caliper?
A shopper on Aug 4, 2017
BEST ANSWER: It depends on the rotor size. The avid calipers (specifically the BB7's) have a large tab that will hit the black spider piece on the 140mm rotor. I believe you can get away with it on the 160mm rotors. The quick fix for making them work regardless is to just file down the tab on the BB7 pad (assuming those are the brakes you are using). So regardless, just make sure that your brake caliper pads don't have a large tab that could hit the spider.
does this rotor come with the lockring?
A shopper on Apr 3, 2017
BEST ANSWER: Yes, it includes an SM-RT96 Lockring. This is the smaller lockring that installs on QR or 12mm axle rear hubs with the cassette lockring tool (like the Park FR-5).

If you are using thru-axle hubs 15mm and up, you will require the SM-HB20 lockring (attached) that has clearance for 15 or 20mm thru-axles, that installs using the external BB tool (like the Park BBT-9).
Shimano HB20 15/20mm Rotor Lockring
Shimano HB20 15/20mm Rotor Lockring
Do the rotors come with a lock ring?
Dan on Jun 20, 2016
BEST ANSWER: Yeah, they should work with that set up. They are individually sold.
is this individual or for as a set?
MarkO on Apr 14, 2016
BEST ANSWER: Just one rotor.

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.