Shimano XT FC-M8100-1 Hollowtech II Cranks

Item number: 81617
XT FC-M8100-1 Hollowtech II Cranks - black/180.0 mm
XT FC-M8100-1 Hollowtech II Cranks - black/180.0 mm
XT FC-M8100-1 Hollowtech II Cranks - black/180.0 mm
XT FC-M8100-1 Hollowtech II Cranks - black/180.0 mm
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00

The Shimano XT FC-M8100-1 crank provides a smoother ride

The FC-M8100 12-speed XT crank from Shimano produces a chainline of 52 mm when ridden with a single chainring, and is suitable for frames with both 142 mm and 148 mm over locknut dimensions. The crank is based on a direct-mount system, which ensures a quick chainring change. Combine it with a Shimano Dynamic Chain Engagement+ chainring with a high-precision tooth profile (not included) and you get a front drivetrain of the highest efficiency and low noise that guarantees good chain retention. The stiff and light design of the FC-M8100 with its hollow-forged crank arms helps to increase fun and efficiency on any kind of trail. By the way, the crank can also be fitted with two chainrings, resulting in the model FC-M8100-2 for 48.8 mm chainline.


Application: Enduro, All Mountain, Cross Country
Compatibility: 1x, 2x
Chainring Mount: Shimano Direct Mount

Technical Information:

Series: Deore XT M8100
Crank Arm Material: Aluminium
Axle Material: steel
Crank Arm Length: 165.0 mm, 170.0 mm, 175.0 mm, 180.0 mm
Chainline: 52 mm (1x), 48.8 mm (2x)
Q-Factor: 172 mm
Axle Diameter: 24 mm
Compatible BSA Shell Width: 68 mm / 73 mm
Recommended Bottom Bracket: BB-MT800 or BB-MT800-PA Press Fit Hollowtech II (not included)
Recommended Chain: HG 12-speed (e.g. CN-M8100)


MTB 12-speed:
Rear Over Locknut Dimension:
- quick release / 1x: 135 mm, 141 mm
- quick release / 2x: 135 mm
- thru-axle / 1x: 142 mm, 148 mm
- thru-axle / 2x: 142 mm
Shifter: SL-M9100, SL-M8100, SL-M7100 (with 2x)
Front Derailleur: FD-M9100, FD-M8100, FD-M7100 (with 2x)
Bottom Bracket: SM-BB93, SM-BB80, BB-MT800, SM-BB52, BB-MT501, BB-MT500, SM-BB94-41A, BB-MT800-PA, BB-MT500-PA
- 1-speed: SM-CRM85
- 2-speed: Y-0J826000, Y-0J898010
Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100-12


- smoother riding on rough terrain
- stiff and lightweight design accommodates aggressive trail riding
- hollow forged crank arms maximize power transfer and minimize weight
- anodised crank arms


Hollowtech II
Shimano Hollowtech II is a crank bottom bracket system designed to achieve an ideal ratio of stiffness, weight and rotational efficiency. It is based on an integration of the bottom bracket and the right crank arm and works with a 24 mm axle or bearing diameter, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside so that the load is better distributed. High-quality precision seals ensure a long service life.

Manufacturer Numbers:

165.0 mm: I-FCM81001AXXT
170.0 mm: I-FCM81001CXXT
175.0 mm: I-FCM81001EXXT
180.0 mm: I-FCM81001GXXT


- 1 x Shimano XT FC-M8100-1 crank
- 1 x Shimano lockring
- 1 x Shimano crank bolt

Order Together:

- Single Chainrings SM-CRM85 (28, 30, 32, 34, 36 T)
- TL-FC41 Chainring Assembly Tool


  • black/175.0 mm: 608 g (mit 28 Z, nicht im Lieferumfang)


  • black/165.0 mm, in stock
  • black/170.0 mm, in stock
  • black/175.0 mm, in stock
  • black/180.0 mm, in stock

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