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ShimanoXT BR-M8100 Disc Brake


Item # SHIU18G

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  • Black, Left/Front ($169.99)
  • Black, Right/Rear ($169.99)
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Item # SHIU18G

Why We Like The XT BR-M8100 Disc Brake

Updated, refined, and ready to dominate smooth ribbons of singletrack, Shimano's XT BR-M8100 Disc Brakes hit the trail once again with their lightweight, sleek aesthetics, and unbeatable stopping power. While a lot of the composition of the brake stays true to its predecessor, the 8000-series brake, like its two-piston design, integrated master cylinder, and clean black aesthetic, features a redesigned brake lever based on the XTR 9100 series that's optimized for refined ergonomics, allowing you to test the limits with confidence and control. And along with this improved bracing angle, its new mounting design pairs up with I-Spec EV to save you space in the cockpit, so you've got plenty of room for dropper posts, remote lockouts, and accessories.

The new XT 8100 brake lever packs in 10% more stiffness than the 8000-series, even under high temperature, this translates to quicker brake engagement, while the new mounting position makes for shorter free stroke. Its new mounting position moves the clamp more inboard, which ads an extra contact point between the bar and lever. What this translates to is a drastic increase in efficiency and control over the bike, without limiting brake engagement. Additionally, the lever stays the same over all of the 8100-series brakes, so you can maintain identical cockpit comfort from your rowdy enduro whip to your cross-country race machine.

  • Shimano's most popular brake for enduring XC enthusiasts
  • Stiffer lever offers faster braking than before
  • Ceramic pistons reduce heat accumulation
  • Finned pads further contribute to cooling
  • New brake lever clamp improves bracing and control under pressure
  • Lever is now compatible with both 8100 and 8120 calipers
  • Updated clamp pairs with new I-Spec EV system for a clean cockpit

Tech Specs
Lever Adjustabilityreach, free throw
Mount Typepost
Fluidmineral oil
Rotornot included

Actual Weight

Black, Left/Front
Black, Right/Rear

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead


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

Have questions? Chat with a Gearhead

What do you think about this product?



Is this product compadable with my motobecane mountain bike

Hey Chris, These brakes will work on your Motobecane bike, but you'll also need the compatible Shimano XT rotors to go along with them. Thanks,

>Rating: 5

Night and day difference from old Juicy3

I've put it through the wringer
True to size

My Gary Fisher 29er might be 10 years old. Bike sat for a few years and tubes dry rotted. Replaced pads and fluid change with not much luck on the old Juicy 3s. Replaced with these and now I can lock up the brakes for the first time in 10 years. Very pleased

I did the same thing with my 11-year-old Gary Fisher Superfly. The XT models are more fun and easier to use than the old single digits. Let’s hear it for mineral oil.


Hi guys. I see that the olive is now pre-installed into the lever. When installing a second (or shortened first) hose, how do we get the second olive into the lever? Or do we have to buy a second lever?

>Rating: 5

Shimano brakes are great

I've put it through the wringer

Nothing to really say here...if you want your bike to stop, by these. Easy setup, great feel...been riding Shimano for years.