Shimano Deore XT M8100 XC Race Groupset 2x12-speed

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Description of Shimano Deore XT M8100 XC Race Groupset 2x12-speed


Shimano Deore XT M8100 - The world is your canvas.

The original MTB group continues its legacy of remaining the standard for mountainbikers everywhere. Nearly three decades in, the Deore XT brand is defined by its trail-tested durability, reliability and performance. As mountainbiking becomes faster and faster and the terrain even more technical, the M8100 series aims to give the rider the necessary feeling of confidence and safety.

Following the principle of passing on the experiences and technologies of the top series, the Deore XT incorporates the innovations of the high-end XTR components. Accordingly the new 12-speed groupset features of course Micro Spline and Hyperglide+.


The Shimano Deore XT M8100 2x12-speed groupset consists of:

  • Deore XT SL-M8100-I shift lever (I-Spec EV, left + right)
  • Deore XT BL-M8100 brake lever (left + right)
  • Deore XT BR-M8120 Enduro / Trail disc brake caliper (Post Mount, front + rear)
  • Deore XT FC-M8100-2 crankset
  • Deore XT FD-M8100 Side Swing front derailleur (Front Pull)
  • Deore XT RD-M8120-SGS Shadow RD+ rear derailleur (long)
  • Deore XT CS-M8100 cassette (10-45 teeth)
  • Deore XT CN-M8100 chain (incl. SM-CN910-12 Quick Link)

Hubs, brake discs and bottom bracket cups are not included. These can be ordered separately.



Shimano Deore XT SL-M8100 Rapidfire Plus shifting lever

The Shimano Deore XT SL-M8100 shift lever allows quick and easy shifting, so the rider can solely focus on the Trail ahead. Compared to its predecessor, the SL-M8000, the shifting operation force could be reduced by 35 % while the main lever access is now 20 % faster thanks to a clever design. In addition, the lever's rubberized contact surface ensures maximum ergonomics.

The I-Spec EV construction already familiar from the XTR M9100 has also found its way into the Deore XT M8100 components. With this technology the shifting levers can be mounted directly to the brake lever, what makes it possible to dispense with a clamp and to significantly increase the adjustment range. I-Spec EV allows 14 mm for longitudinal and 60° for rotational adjustment so that each rider can make a setup to suit his or her individual anatomy or preferences.

Shimano Deore XT BL-M8100 brake lever

The Shimano Deore XT BL-M8100 brake lever's clamp is angled what leads to direct contact between compensation tank and handlebar. The so created two contact points provide significantly increased stiffness, which ultimately results in more direct feedback and thus more braking power.

The braking performance is optimized as well by the Shimano SERVOWAVE technology which improves the lever's modulation ability. Because the brake lever absorbs a lot of braking distance right at the start of its movement, the brake pads have disc contact more quickly and it remains more lever travel to adjust braking force. That is why SERVO WAVE brake systems are characterized by faster response, higher performance and shorter idle travel.

The BL-M8100 is even under high temp conditions 10 % stiffer than its predecessor. The brake lever's reach is individually adjustable without the use of any additional tools. Thanks to the I-Spec EV design the Deore XT SL-M8100-I shifting levers can be mounted directly to the brake lever.

Shimano Deore XT BR-M8100 disc brake caliper

The Shimano Deore XT BR-M8100 Postmount brake caliper is with its 2-piston construction perfect for Cross Country use. Compared to its predecessor a quicker piston retraction leads to superior modulation what results in an improved braking control. The G03A Resin brake pads in combination with the light 2-piston caliper guarantee extremely good deceleration and low weight at the same time.

Shimano Deore XT FC-M8100 crankset

For all those who are drawn to unknown terrain, the Shimano Deore XT FC-M8100 2x12-speed crankset offers the ultimate range for all eventualities. The chainring ratio with 36 to 26 teeth in combination with the 10-45 teeth cassette (sold separately) offers almost unlimited possibilities to tackle any imaginable terrain while low gear jumps still keep the cadence constant.

To ensure an efficient power transmission, the 2-speed crankset offers not only a rigid but, thanks to its hollow forged crank arms, also a light design. For a quick and secure chainring installation the crank for aggressive Trail riding features a Direct Mount system. Thanks to the chainring's Dynamic Chain Engagement+ technology, the FC-M8100-2 crankset holds the chain safely even on rough terrain and guarantees at the same time an efficient, smooth and quiet drivetrain.

Technical details of the 2x12-speed crankset:

  • chainline: 48.8 mm
  • Q-Factor: 172 mm
  • recommended rear O.L.D.: 142 mm

Shimano Deore XT FD-M8100 Side Swing front derailleur

The Shimano Deore XT FD-M8100 front derailleur's side swing mechanism ensures smooth shifting. The FD-M8100 adapts chain lines between 48.8 and 51.8 mm and is therefore also compatible with Boost O.L.D. The Deore XT FD-M8100 front derailleur is available as E-Type (FD-M8100-E) and Direct Mount (FD-M8100-D) version as well as for the middle clamp position (FD-M8100-M).

Shimano Deore XT RD-M8120-SGS Shadow RD+ rear derailleur

The Shimano Deore XT RD-M8100-SGS rear derailleur provides fast and precise shifting operations over a wide gear range. Guide and tension pulleys with 13 teeth and a rubber damper reduce noise and increase ride comfort. They also improve the chain's grip under all conditions.

Shimano Deore XT CS-M8100 cassette

The Shimano Deore XT CS-M8100 cassette features the Hyperglide+ technology which guarantees high shifting speed, precision and smoothness when shifting up and down and contributes to an extremely quiet drivetrain. The 12-speed cassette is available in 2 versions: 10-45 and 10-51 teeth.

The 10-45 teeth cassette produces as few gear jumps as possible while the 10-51 teeth cassette covers a wide gear range. Both versions have an aluminium spider construction and the two largest sprockets are made of aluminium each as well. This not only reduces the weight, but improves also robustness and longevity.

Shimano Deore XT CN-M8100 chain

The Deore XT chain has been optimized from the ground up and is an integral part of the new 12-speed drivetrain. With its high precision formed contact surfaces to Dynamic Chain Engagement+ chainring and Hyperglide+ cassette teeth, the Shimano Deore XT CN-M8100 chain provides fast, precise and smooth shifting in both directions even under highest loads. Chrome-plated inner plates increase the durability noticeably.


If you need more detailed information about the single parts of the groupsets check the articles in the referring categories.


Manufacturer's item codes:

  • shifting levers: ISLM8100ILBP + ISLM8100IRAP
  • brake system: IM8100JLFPRA100 | IM8100JLFPNA100 + IM8100JRRXRA170 | IM8100JRRXNA170
  • crankset: IFCM81002AX66 | IFCM81002CX66 | IFCM81002EX66 | IFCM81002GX66
  • front derailleur: IFDM9100D6 | IFDM9100E6 | IFDM9100MX6
  • rear derailleur: IRDM8120SGS
  • cassette: ICSM8100045
  • chain: ICNM8100116Q | ICNM8100126Q | ICNM8100138Q
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Fact Sheet of Shimano Deore XT M8100 XC Race Groupset 2x12-speed

Product Name: Shimano Deore XT M8100 XC Race Groupset 2x12-speed
Manufacturer: Shimano Parts
Item Code: SHI433226
Manufacturer item code: see description
Derailleur: 12-speed
Derailleur short/long: long
Derailleur, max. number of teeth: 45
Capacity of derailleur: 45
Chain Line in mm: 48.8
Included in delivery: see description
brake system filled and bleed
without discs, bottom bracket cups and hubs
Crank length: 165 ||| 170 ||| 175 ||| 180
Chainwheel, number of teeth: 36/26 teeth
Nuance of sprocket / Gearing: 10-12-14-16-18-21-24-28-32-36-40-45
Version of front derailleur: Mid Clamp
Bracket, profile of axle: Hollowtech II (integrated BB axle, 24 mm)
Manufacturer page: http://www.shimano-europe.com/
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Item includes
Still 10+ in stock in stock, delivery time 11-12 days Shimano Deore XT SL-M8100 Rapidfire Plus Shifting Lever - I-Spec EV - 12-speed - right
Still 10+ in stock in stock, delivery time 11-12 days Shimano Deore XT RD-M8120-SGS Shadow RD+ Rear Derailleur - long - 2x12-speed
Still 10+ in stock in stock, delivery time 11-12 days Shimano Deore XT SL-M8100 Rapidfire Plus Shifting Lever - I-Spec EV - 2-speed - left
Still 10+ in stock in stock, delivery time 11-12 days Shimano Deore XT CS-M8100 Cassette 12-speed – Sprocket Ratio 10-45 teeth
Selection: Shimano Deore XT BL-M8100 + BR-M8100 XC Race Hydraulic Disc Brake - I-Spec EV - Set FW
Still 10+ in stock in stock, delivery time 11-12 days Brake Pads G03S Resin
Still 10+ in stock in stock, delivery time 11-12 days Brake Pads J04C Metal
Selection: Shimano Deore XT BL-M8100 + BR-M8100 XC Race Hydraulic Disc Brake - I-Spec EV - Set RW
Still 10+ in stock in stock, delivery time 11-12 days Brake Pads G03S Resin
Still 10+ in stock in stock, delivery time 11-12 days Brake Pads J04C Metal
Selection: Shimano Deore XT FC-M8100-2 Crankset 2x12-speed
Still 4 in stock in stock, delivery time 11-12 days Crank Arm Length 165 mm
Still 10+ in stock in stock, delivery time 11-12 days Crank Arm Length 170 mm
Still 10+ in stock in stock, delivery time 11-12 days Crank Arm Length 175 mm
Still 3 in stock in stock, delivery time 11-12 days Crank Arm Length 180 mm
Selection: Shimano Deore XT FD-M8100 Side Swing Front Derailleur - 2x12-speed - Front Pull
Still 10+ in stock in stock, delivery time 11-12 days Model - Installation FD-M8100-D - Direct Mount
Still 10+ in stock in stock, delivery time 11-12 days Model - Installation FD-M8100-E - E-Type (without BB Plate)
Still 9 in stock in stock, delivery time 11-12 days Model - Installation FD-M8100-M - Mid Clamp
Selection: Shimano Deore XT CN-M8100 Chain 12-speed - with Quick Link
Still 10+ in stock in stock, delivery time 11-12 days Number of Links 116
Still 10+ in stock in stock, delivery time 11-12 days Number of Links 126
Still 10+ in stock in stock, delivery time 11-12 days Number of Links 138
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