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ShimanoXTR BR-M9100 Disc Brake Caliper


Item # SHI00NY

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  • Stealth Gray, FRONT OR REAR ($164.99)
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Item # SHI00NY

XTR BR-M9100 Disc Brake Caliper

With the release of Shimano's XTR M9100 groupset comes new and improved brakes, too. The XTR BR-M9100 Disc Brake Caliper is sleek 2-piston caliper offering powerful braking performance at an impressive race-ready weight. When paired with XTR M9100 levers (sold separately), this caliper offers higher braking force, with reduced input force, massively speeding the linear response and braking power, and reducing lag time by a claimed 30% compared to its predecessor. It features a redesigned high-rigidity brake hose, and one-piece aluminum caliper to keep things minimalist, while maintaining stopping as its top priority. This makes it ideal for cross-country racing, as it minimizes weight, thanks to the one-piece aluminum design and straight threaded fitting.

Also coming to market this year is Shimano's new M9120 Brakeset, and you might be wondering where the M9100 falls in comparison. If we're comparing to years past, the M9100 falls in line with the Race model, while the M9120 is more similar to the Trail model. This means that while the M9120 packs in just about every feature, like Servo Wave technology and free-stroke adjust, the M9100 opts for a clean, feathery, minimalist design. While you can still adjust your levers with a tool in your shop or home garage, the M9100 isn't designed for adjustment on the go, allowing for major weight savings. In the back, the M9100 uses the lighter 2-piston system that offers more than enough stopping power for your XC rig, while the beefier M9120 opts for 4-piston system that's needed for stopping heavier enduro rigs. Both have been optimized for Shimano's newest IceTech Freeza rotors to drop heat as quickly as possible, even at high speeds.

The Shimano XTR BR-M9100 Disc Brake Calipers are sold individually, so please order two of them if you'd like a pair. The levers and rotors are sold separately, so please factor those into your decision as well.

  • Shimano's top-tier XTR calipers designed for XC racing
  • Higher braking force with 30% reduced input lag vs. M9000
  • One-piece aluminum caliper sheds weight, but not power
  • 26g lighter than M9000 with lever and rotor factored in
  • Claims 10% boost in stiffness above M9000, even at high temp
  • 2-pistons offer speedy stopping power under pressure
  • Optimized for M9100 lever and MT900 rotor (sold separately)

Tech Specs
Materialone-piece aluminum
Typehydraulic disc
Mount Typepost
Rotor Size140 - 180mm
Recommended Usecross-country, trail
Manufacturer Warranty3 years

Actual Weight

Stealth Gray, FRONT OR REAR

Claimed Weight

Claimed weights are provided by the vendor.

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

Have questions? Chat with a Gearhead

What do you think about this product?



Can this caliper be paired with a Dura Ace or Ultegra hydraulic road lever? I have an older model cyclocross frame that has post mounts. As far as I can tell, there's no way to make the direct mount Dura Ace calipers work on post mount frames. Thanks!

Hi Gary, This can be paired with an Ultegra or Dura Ace hydraulic lever, we just need to make sure that we use the correct brake hose. This caliper uses brake hose SM-BH90-SS, whereas a Dura Ace Capliper would use SM-BH90-JK-SSR. These are very similar hoses, but they differ in the method that they attach to the caliper. If you need any help finding the correct hose to make this work for your bike, feel free to shoot me an email at ibird@backcountry.com, call us at 1-888-276-7130, or hop on the live chat on our website, and any one of our gearheads can help you out! I hope that was helpful. Regards, Ian B Competitive Cyclist Gearhead