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XTR BL-M9100 Disc Brake

4 out of 5 stars
1 Review
Current price: $227.49 - $292.49 Original price: $324.99
Up to 30% off



Why We Like The XTR BL-M9100 Disc Brake

When Shimano launched its all-new 12-speed groupset, we would be lying if we said we weren't eager to see every little piece of the puzzle. Sure, we're excited about the cassette, and all-new derailleur system, but we also wanted to see what race-ready improvements came to other components, like the XTR BLM-9100 Disc Brakes. Aligning with the XTR 9000 Race of years past, the M9100 Disc Brakes bring a clean, minimalist approach to your cockpit, both in its sleek, frill-free aesthetic, and in its featherweight class that lands in at 26-grams lighter than its predecessor — all without reducing XTR's next-level stopping power.

Shimano made some major changes when it comes to the cockpit side of this brakeset, both in the construction, and positioning of the brake levers. They use a new magnesium master cylinder to shed grams, and feature I-Spec EV that moves the clamp inward from the previous I-SPEC design so that the new master cylinder contacts the bar. This extra point of contact boosts rigidity, improving braking power for better control when you're in over your head coming into a hairpin corner. In addition to the new I-Spec configuration, Shimano employs a new brake lever shape with ergonomics in mind, to comfortably allow dual-finger braking for seamless operation. Shimano claims that the new brake design offers a whopping 10% increase in stiffness above M9000, even under high-temperature conditions.

You may have also spotted Shimano's M9120 Brakeset on our site, 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 ever feature, like Servo Wave adjustment, 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 IceTec Freeza rotors to drop heat as quickly as possible, even at high speeds.


  • Cream-of-the-crop brakes for dominating XC race day
  • Reduces input lag by 30% compared to M9000
  • 1-piece aluminum caliper sheds weight, but not power
  • Claims 10% boost in stiffness above M9000, even at high temp
  • Magnesium master cylinder and carbon levers shed weight
  • 2-pistons offer speedy stopping power under pressure
  • Compatible with I-Spec EV for improved rigidity and braking response
  • Item #SHI00L7
Lever Adjustability
Shimano BR-M9100
Mount Type
Shimano mineral oil
not included
Claimed Weight
11oz (312g)
cross-country, trail
Manufacturer Warranty
3 years

Overall Rating

4 based on 1 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
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4 Stars - 1 reviews
5 Stars - 0 reviews

Fits True To Size

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4 out of 5 stars

October 26, 2021

Super high end but garbage pads!

I've used it several times
5' 8"

These breaks are super light and look great. I was building a bike with weight in mind so I went with these XTR brakes. To keep with the weight theme I bought Magura rotors. After I installed them I did a simple bleed at the levers and hit the trail. The braking power was terrible. The bike I built was super fast but I was so nervous with these brakes. I bought them because I wanted the Shimano bite feel but these felt like SRAM breaks! I tried upgrading the the rear rotor from 160 to 180 but it didn't make a difference. Tried a full bleed with no luck. Next I tried removing the pads and making sure there was no sheen and ruffed them up. Tried a proper full bleed and then bed in with no luck. My last move was to buy new composite pads and that did the trick! Way better and finally feel like Shimano breaks! Can't understand how such expensive brakes could come with what seemed to me like garbage pads. They look amazing, are really light and finally perform!