Shimano XT M8100 1x12-speed Group
The original MTB group, reborn in 12-speed
Specifications
- Speed
- 12-speed
- Derailleur
- RD-M8100 SGS Shadow RD+
- Shifter
- SL-M8100 I-Spec EV RAPIDFIRE Plus
- Crankset
- FC-M8100-1 HOLLOWTECH II
- Crank Lengths
- 165mm
- Chainring
- SM-CRM85 28-36T (sold separately)
- Cassette
- CS-M8100 10-51T
- Chain
- CN-M8100 126L
- Gear Range
- 510%
- Weight
- Approx. 1900g
- Features
- Mechanical, HYPERGLIDE+, Shadow RD+
Overview
Deore XT M8100 continues its legendary legacy as the definitive mountain bike benchmark. This mechanical 12-speed group features HYPERGLIDE+ shifting under load, a HOLLOWTECH II forged crank with DYNAMIC CHAIN ENGAGEMENT+ tooth profile, Shadow RD+ clutter-dampening derailleur, and the I-Spec EV shift lever for an action-optimised cockpit. The 10-51T cassette on MICRO SPLINE delivers 510% gear range for trail and enduro.
Features
HYPERGLIDE+ shifting under load
Shadow RD+ low-profile chain-retention derailleur
HOLLOWTECH II forged crankset
DYNAMIC CHAIN ENGAGEMENT+ tooth profile
I-Spec EV cockpit integration
20% quicker lever access time
2-WAY RELEASE RAPIDFIRE Plus lever
MICRO SPLINE 10-tooth sprocket freehub
13-tooth low-friction pulleys
Wide 10-51T cassette for 510% range
E-MTB compatible chain
Trail and enduro optimised
Guides for setup
All guidesChain Maintenance
Essential tips for cleaning, lubrication, and extending component life.
Derailleur Indexing
Fine-tune cable tension, limit screws, and B-gap for crisp, accurate shifting under load.
Weather & Conditions Adaptation
Setup adjustments for wet, muddy, dry, and cold conditions — tires, suspension, drivetrain, and brakes.
How we evaluate this component
Product cards, analysis notes, and setup guidance are grounded in public specifications, market positioning, compatibility, and the most likely real-world use cases on trail.
Read the full methodology