Drivetrain
Shimano Deore XT range · 3 versionsShimanoDeore XT M8100 12-Speed
No RRP published on the accessible Shimano spec site
- Speeds
- 12
- Range
- 10-45T / 10-51T
- Shifting
- Mechanical
- Max. low sprocket
- 51T
- Derailleur hanger
- UDH
- Weight
- 284 gRD-M8100-SGS, average weight per Shimano spec chart
Overview
Deore XT M8100 12-Speed: mechanical 12-speed Deore XT drivetrain with the RD-M8100-SGS derailleur (up to 51T, 284 g) and CS-M8100-12 cassette.
The Deore XT M8100 12-Speed groupset is Shimano's Deore XT mechanical 1x12 mountain bike drivetrain, built around the RD-M8100-SGS rear derailleur (HG 12-speed chain, up to 51T low sprocket, 41T capacity).
It pairs with the SL-M8100-R shifter and the CS-M8100-12 cassette (10-45T, 10-51T; average weight 461 (10-45T) 470 (10-51T) g) and the FC-M8100-1 crankset. It is the previous-generation series, still listed in Shimano's current spec chart.
- 12-speed HG mechanical drivetrain
- RD-M8100-SGS derailleur, up to 51T, 41T capacity
- Cassette 10-45T, 10-51T
- UDH compatible derailleur
Gallery
Full specifications
Rear derailleur (RD-M8100-SGS)
- Series
- DEORE XT
- Model no.
- RD-M8100-SGS
- Color / 1
- Series color
- Rear speeds
- 12
- Compatible chain
- HG 12-speed
- RD construction / SHIMANO SHADOW RD+
- Yes
- Applicable derailleur hanger / SHIMANO MTB type / Direct attachment (conventional)
- Yes
- Applicable derailleur hanger / UDH standard
- Yes
- Max. front difference
- 0T
- Total capacity
- 41T
- Low sprocket / Max.
- 51T
- Low sprocket / Min.
- 51T
- Top sprocket / Max.
- 10T
- Top sprocket / Min.
- 10T
- Fluoric coated link bushings
- 7
- Pulley / Guide pulley bearing
- Sealed bearing
- Pulley / Tension pulley bearing
- Sealed bearing
- Pulley / Teeth
- 13T
- Pulley / Screws material
- Stainless steel
- Pulley / Sunken type pulley screw
- Yes
- B-axle / Hollow axle
- Yes
- B-axle / Material
- Stainless steel
- Bracket body / Material
- Aluminum
- Bracket body / Finish
- Painted
- P-axle / Material
- Steel
- Plate body / Material
- GFRP
- Outer link / Material
- Aluminum
- Outer link / Finish
- Painted
- Inner link / Material
- Aluminum
- Inner link / Finish
- Painted
- Outer plate / Material
- Aluminum
- Outer plate / Finish
- Painted
- Inner plate / Material
- Aluminum
- Inner plate / Finish
- Painted
- Cable fixing screw / Material
- Stainless steel
- Stroke adjusting screw / Material
- Steel
- Stroke adjusting screw / Finish
- Plated
- Average weight (g)
- 284
- Note
- w/Bumper on pully cage
Shifter (SL-M8100-R)
- Series
- DEORE XT
- Model no.
- SL-M8100-R
- Color / 1
- Series color
- Shifter type
- RAPIDFIRE PLUS
- Rear speeds
- 12
- Compatible rear derailleur type
- 12-speed
- Mount type / Clamp band
- Yes
- Shift lever cable adjust
- Yes
- Max. multiple shifts (main lever/rear)
- 4
- Release function / MULTI RELEASE
- Yes
- Release function / INSTANT RELEASE
- Yes
- Release function / 2-WAY RELEASE
- Yes
- OPTICAL GEAR DISPLAY / Without
- Yes
- Multi-bearing construction
- 2
- Shift lever bracket / Material
- Aluminum
- Shift lever bracket / Finish
- Painted
- Clamp screw / Material
- Stainless steel
- Clamp screw / Finish
- Black
- Main lever body / Material
- Aluminum
- Main lever body / Finish
- Painted
- Release lever body / Material
- Steel+GFRP
- Base cover / Material
- GFRP
- Base cover / Finish
- Painted
- Shift lever cable / Inner cable / OPTISLICK
- Yes
- Shift lever cable / Inner cable / Stainless
- Yes
- Recommended shift lever outer casing
- OT-SP41
- Average weight (g)
- 117 ( /pc)
- Note
- w/Rubber grooved grip (main lever)
Cassette (CS-M8100-12)
- Series
- DEORE XT
- Model no.
- CS-M8100-12
- Type
- HYPERGLIDE+
- Rear speeds
- 12
- Compatible chain
- HG 12-speed
- Combination name (Group name)
- 10-45T, 10-51T
- Combination * Titanium gear / 1
- 10-12-14-16-18-21-24-28-32-36-40-45T
- Combination * Titanium gear / 2
- 10-12-14-16-18-21-24-28-33-39-45-51T
- Spline type / MICRO SPLINE
- Yes
- Aluminum spider arm / QTY (pcs)
- 1
- Aluminum spider arm / Finish
- Painted
- Aluminum gear / QTY (pcs)
- 2
- Aluminum gear / Finish
- Anodized
- Steel gear / QTY (pcs)
- 10
- Steel gear / Finish
- Plated
- Lock ring / Material
- Aluminum
- Lock ring / Finish
- Anodized
- Average weight (g)
- 461 (10-45T) | 470 (10-51T)
Crankset (FC-M8100-1)
- Series
- DEORE XT
- Model no.
- FC-M8100-1
- Color / 1
- Series color
- Rear speeds
- 12
- Compatible chain
- HG 12-speed
- Chain line (mm)
- 52
- O.L.D. / Thru (mm) / 148
- Yes
- O.L.D. / Thru (mm) / 142
- Yes
- O.L.D. / QR/Nut (mm) / 141
- Yes
- O.L.D. / QR/Nut (mm) / 135
- Yes
- P.C.D. (mm)
- Direct
- Spider/gear arms
- 4
- Chainring combination
- 28T, 30T, 32T, 34T, 36T
- Q-factor (mm)
- 172
- Crank arm length (mm) / 165
- Yes
- Crank arm length (mm) / 170
- Yes
- Crank arm length (mm) / 175
- Yes
- Crank arm length (mm) / 180
- Yes
- Optional chain guard / Without chain/bash guard
- Yes
- HOLLOWTECH II
- Yes
- Compatible bottom bracket type / Outboard
- Yes
- Recommended bottom bracket / Threaded (normal)
- BB-MT801
- Recommended bottom bracket / Press-Fit
- BB-MT800-PA
- Threaded bottom bracket shell width (mm) / 68
- Yes
- Threaded bottom bracket shell width (mm) / 73
- Yes
- Crank arm / Material
- Aluminum
- Crank arm / Finish
- Anodized
- Crank axle / Material
- Steel
- Crank axle / Finish
- Plated
- Outer ring / Material
- Steel (teeth), CFRP (body), Aluminum (arm)
- Outer ring / Finish
- Painted (teeth), Anodized (arm)
- Crank fixing screw included
- Yes
- Average weight (g) (170 mm, w/o bottom bracket)
- 612 (28T) | 626 (30T) | 624 (32T) | 637 (34T) | 655 (36T)
Manufacturer specification — Shimano. Specs and prices can change; check with the brand or your dealer.
Shimano Deore XT versions compared
| Deore XT M8220 4-Piston | Deore XT M8200 12-Speed | Deore XT M8100 12-Speed | |
|---|---|---|---|
| Price | — | — | — |
| Pistons | 4 (resin) | — | — |
| Rotor sizes | 160 / 180 / 200 / 203 / 220 mm | — | — |
| Fluid | SHIMANO low viscosity oil | — | — |
| Mount | Post mount | — | — |
| Lever | BL-M8200, tool-free reach adjust | — | — |
| Speeds | — | 12 | 12 |
| Range | — | 9-45T / 10-51T | 10-45T / 10-51T |
| Shifting | — | Mechanical | Mechanical |
| Weight | 148 g | 367 g | 284 g |
| E-bike rated | — | — | — |
eMTBs that come with the Shimano Deore XT
Cube · TrailStereo Hybrid ONE44 HPC SLX 800Bosch CX · 800 Wh · 150 / 140 mm€4,999
Haibike · All-mountainALLMTN 6Bosch CX · 800 Wh · 160 / 150 mm€5,499
Focus · All-mountainJAM LTDBosch CX · 600 Wh · 160 / 150 mm€7,499
Canyon · Trail / All mountainSpectral:ON CF 8Shimano EP801 · 800 Wh · 160 / 155 mm€4,499
Simplon · EnduroRapcon :e Ultimate+Bosch CX Gen5 · 800 Wh · 160 / 160 mm€9,779
Canyon · Trail / All mountainSpectral:ON CF 9 Di2Shimano EP801 · 800 Wh · 160 / 155 mm€4,999
Santa Cruz · TrailVala XT Di2 RSVBosch CX · 600 Wh · 160 / 150 mm£9,999
Cube · EnduroStereo Hybrid ONE77 HPC SLX 800Bosch CX · 800 Wh · 170 / 170 mm€4,999
Haibike · All-mountainALLMTN CF 9.5 ABSBosch CX · 800 Wh · 160 / 150 mm€8,000
Cube · Trail / TouringStereo Hybrid ONE44 SLX 800Bosch CX · 800 Wh · 140 / 140 mm€4,699
Giant · TrailStance E+ 0Giant SyncDrive Pro 3X · 800 Wh · 150 / 140 mm£4,999
Scott · TrailStrike eRIDE 10Bosch CX · 800 Wh · 150 / 150 mm£5,399
Shimano Deore XT M8100 12-Speed: FAQ
How much does the Shimano Deore XT M8100 12-Speed weigh?
Shimano quotes 284 g (RD-M8100-SGS, average weight per Shimano spec chart).
Is the Shimano Deore XT M8100 12-Speed suitable for e-bikes?
Shimano does not specifically rate it for e-bikes. Check the manufacturer’s approval and your bike maker’s recommendations before fitting it to an eMTB.
What are the key specs of the Shimano Deore XT M8100 12-Speed?
Speeds: 12; Range: 10-45T / 10-51T; Shifting: Mechanical; Max. low sprocket: 51T; Derailleur hanger: UDH.
What other versions of the Shimano Deore XT are there?
Deore XT M8220 4-Piston, Deore XT M8200 12-Speed.
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E-bike ratedDeore Di2 M6260 (E-Bike)12 (HG) / 11 (LINKGLIDE) · 10-51T (12-speed cassette)
E-bike ratedDeore XT Di2 M8150 (E-Bike)12 / 11 · 51T (12s) / 50T (11s)
Deore M7200 12-Speed12 · 10-51T
Deore M6200 12-Speed12 · 10-51T
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