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Shimano XTR SM-RT99 Disc Brake Rotor

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With the latest generation, the XTR SM-RT99 Disc Brake Rotor is better than ever.

With these disc brake rotors, Shimano has upgraded their already fantastic Ice Tech design. Like all Ice Tech rotors, these are made with an aluminum core sandwiched between two stainless steel braking surfaces. This combination of materials leads to phenomenal heat dissipation and rotor life, while keeping weight to a minimum as well, appropriate for Shimano's top level XTR group. The additional fins on these rotors serve to further improve heat dissipation leading to an overall improvement over the RT98 rotors. With the RT99, stopping power and pad life are also increased over the previous version.

The SM-RT99 Disc Rotors are optimized for Ice Tech brake pads. Shimano Center Lock compatible. Available in 160mm and 140mm sizes. Actual weight: 114g (160mm, without lockring). Sold individually.

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 

160mm (S)

Mfg PartNum: ISMRT99S 

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Reviewed 5/28/2020
by Sasanoa
Cycling Enthusiast
Value Rating
Overall Rating
BikeTiresDirect great source for Shamano parts

Dependable and easy to replace, I give these Shimano rotors high marks, as well as BTD as a valued supplier.

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Reviewed 5/24/2018
by Anonymous
Cycling Enthusiast
San Jose CA
Value Rating
Overall Rating
Good quality rotor, but doesn't work with Avid brakes

This is a well made product, but it doesn't work with the Avid BB7 brakes, because of it's '3D' shape. I tried adjusting the position, cutting the little legs of the brake pads. No go, there's still something touching a 3D part, it works but this is very annoying.If this is for use with Avid brakes, stick with Avid rotors...

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Reviewed 3/6/2017
by Manuel Tristani
Puerto Rico
Overall Rating
Very nice design product

Nice stop power with minimun noise

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Reviewed 6/12/2017
by CasualBik
Cycling Enthusiast
Portland, OR
Overall Rating
0 of 1 customers found this review helpful.
Reduced weight and better cooling, technology gets better.

The RT-99 is the latest in improved braking with better heat transfer

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Reviewed 4/4/2017
by Anonymous
Cycling Enthusiast
San Jose, CA
Overall Rating
8 of 8 customers found this review helpful.
Shimano's highest end rotor will help control overheatingfading brakes, but you'll need Centerlock hubs and $ to replace them frequently

Pros: Icetech and Freeza technology seem to help control overheating and brake fade over regular rotors, they look kinda awesome too.

Cons: Not the lightest (115g for the rotor w/o 10g lockring) compared to other Centerlock rotors, seems to wear out quite a bit faster than RT86 or other Icetech rotors, Centerlock only compatibility greatly limits wheelhub options.

I've gone through a number of the RT99 rotors (180mm front, 160 rear) and they perform great. On long decents I used to experience brake fade / overheating / pump much sooner with non Icetech rotors. Since switching to Icetech and Freeza I've noticed much more consistent braking performance on long descents. This might also be due to the finned Resin brake pads I was also using. Also, it's hard to quantify how much of a difference the Freeza cooling fins provide over non Freeza rotors.

I actually prefer running Centerlock hubs because they tend to be lighter than their 6 bolt counterparts and the locking interface is so much easier to use (w/ tools you probably already own) than dealing with 6 separate bolts.

Regarding wear - I've been able to squeeze out something like 1700 miles out of the Shimano RT86 Icetech rotor vs. 1100 miles out of a Shimano RT99, both on the same bike setup as a rear rotor with same brake pad compound (resin), using different wheels. I've also experienced a bit of delamination of the steel braking surface and the aluminum core towards the end of it's life - something I never really experienced with the RT86 rotors.

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