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XT SL-M8100 Trigger Shifters

1.5 out of 5 stars
2 Reviews
Current price: $52.03 - $59.84 Original price: $62.99
Up to 17% off

Style & Size:


XT SL-M8100 Trigger Shifters

Along with the release of Shimano's workhorse 12-speed mountain group comes updated shifters as well, offering precise and responsive shifting for improved control on the trail. Featuring refined ergonomics and a lighter shifting action, the new XT SL-M8100 Trigger Shifters provide a claimed 20% quicker lever access and require 35% less shifting force than the previous generation. They also get a rubberized thumb paddle for improved grip on the downshift, with the paddle offering just a bit more surface area than XTR. The key change, however, is the introduction of an I-SPEC EV version of the shifter, which lets riders customize the ergonomics by allowing 14mm of lateral adjustment and 20-degrees of rotational adjustment, making it easy to find the most comfortable position for your hands. That being said, you'll want to stick with the standard handlebar clamp version if you aren't running Shimano brakes.

Perhaps our favorite feature of the XT shifters is Shimano's proven multi-shift function that lets you shift up two gears at once if you need to accelerate quickly on a downhill section of trail. The second click is just a bit firmer than the first one, which prevents any accidental overshifts. We also appreciate the two-way release that let's you choose between pushing or pulling the trigger to initiate an upshift, with the pull function being especially useful in sprint situations.

If you're running a double chainring up front, the left shifter features a Rapid-Fire Mono shift lever that lets you shift both up and down with a single thumb lever. You push it once to shift from the small ring to the big ring. To go the other direction, you give it a little push forward until it clicks, or you can pull to release it and the chain moves back down to the small ring.


  • 12-speed trigger shifters for the new XT mountain groupset
  • Lighter action and improved ergonomics vs. previous generation
  • Rubberized thumb paddle for improved grip while downshifting
  • I-SPEC EV version gives you a wide range of position adjustments
  • Multi-shift function lets you upshift two gears at once
  • Two-way release lets you push or pull the trigger to shift
  • Left shifter uses a single lever for both shifting functions
  • Item #SHIU18L
Crankset Compatibility
Shimano 12-speed
Compatible Components
Shimano M8100 series 12-speed drivetrains
Claimed Weight
[rear, bar clamp] 4.1oz (117g), [rear, I-SPEC EV] 4.2oz (120g), [front, bar clamp] 2.8oz (78g), [front, I-SPEC EV] 2.8oz (78g)
Recommended Use
cross-country, enduro, trail
Manufacturer Warranty
2 years

Overall Rating

1.5 based on 2 ratings

Review Summary

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

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1 out of 5 stars

January 9, 2021

dead shift

I've put it through the wringer

dead shifting into easier gears. broken internal spring as mentioned in another review. only six months of riding.

Jennifer M
2 out of 5 stars

November 8, 2020

I-Spec EV Version Adjustability Sucks

I've put it through the wringer

The shifter itself works great and the setup looks super clean with the I-Spec EV sharing a clamp with the brake lever but the range of adjustability is not very good. I prefer to have my brake levers pretty far inboard for easy one finger breaking and I have them angled downward for more XC style riding. With this brake orientation there is not enough range of motion in the I-spec adjustment to get the shifter in a good spot. I can barely reach the upshift with my index finger and I have to stretch my thumb pretty far backwards to reach the downshift which causes me to hold my bars funny and is resulting in a lot of thumb pain. I wish there was an option to adjust or swap the levers which would allow this to be a perfect setup but I'm probably going to have to by the bar clamp version to improve ergonomics and eliminate the severe thumb pain form having a less than ideal setup.

Corbin J

Originally reviewed on Backcountry.com