Shimano XT FC-M8120-1 Hollowtech II Crank

Shimano XT FC-M8120-1 Crank - Special for 148 mm over locknut dimension

The Shimano FC-M8120 XT 12-speed crank, unlike the FC-M8100-1, produces a chainline of 55mm when ridden with a single chainring. For this reason, it is particularly suited for frames with 148 mm over locknut dimension. 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-M8120 with its hollow-forged crank arms helps to increase fun and efficiency on any kind of trail. By the way, this crank can also be fitted with two chainrings, resulting in the model FC-M8120-B2 for 51.8 mm chainline.

Specifications:

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:

55 mm (1x), 51.8 mm (2x)

Q-Factor:

178 mm

Axle Diameter:

24 mm

Compatible BSA Shell Width:

68 mm / 73 mm

Recommended Bottom Bracket:

BB-MT801 or BB-MT800-PA Press Fit Hollowtech II (not included)

Recommended Chain:

HG 12-speed (e.g. CN-M8100)

Compatibility:

MTB 12-speed:
Rear Over Locknut Dimension:

• quick release: 141 mm
• thru-axle: 148 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-MT801, BB-MT800, SM-BB52, BB-MT501, BB-MT500, SM-BB94-41A, BB-MT800-PA, BB-MT500-PA

Chainrings:

• 1x: SM-CRM85
• 2x: Y-0JB26000, Y-0J898010

Chain:

CN-M9100, CN-M8100, CN-M7100, CN-M6100-12

Features:

• 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

Technology:

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-FCM81201AXXT

170.0 mm:

I-FCM81201CXXT

175.0 mm:

I-FCM81201EXXT

180.0 mm:

I-FCM81201GXXT

Contents:

• 1 x Shimano XT FC-M8120-1 crank
• 1 x Shimano lockring
• 1 x Shimano crank bolt
• 2 x spacers

Order Together:

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