Crankset (1x, 2x)

XT FC-M5100

Contrary to the XTR MTB groupset, there is no triple XT Front Derailleur. Selecting an XT Crankset is therefore a bit easier.

You either use a Front Derailleur and the FC-M5100-2 crankset, or you don't use a Front Derailleur. In that case you would use the FC-M5100-1 single crankset.

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FC-M5100-2

This crankset has a Q-factor of 178.5mm and a chain line of 48.8mm. It comes with a 36-26T chainrings. It'll work with 135 mm and 142 mm O.L.D. frames.

FC-M5100-1

The single crankset has the same Q-factor of 178.5mm, but a slightly different chain line: 52mm. It is meant to be used with 135 mm, 142 mm and 148 mm O.L.D. frames.

Specifications

Model code: FC-M5100
Series: XT M8050
Weight: 850g
Chain line: 48.8mm (2x), 52mm (1x)

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FD-M8070

Front Derailleur (2x)

RD-M8050-GS

Shadow RD+ Medium Cage Rear Derailleur

SW-M8050

Firebolt Shifter

EW-SD50

Electric Wire / E-Tube cable

BT-DN110

Internal Battery

SC-MT800

System Information Display - Junction A

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June 2, 2025Installation Guide

Installing a new chain - length and direction

Sizing and installing a new chain for your Di2 bike isn't hard, you just need to follow the right steps. This page quickly shows the chain sizing methods and explains chain directionality.

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