Front Derailleur

Ultegra FD-R8150

The FD-R8150 is Shimano's first-generation 12 speed Di2 Front Derailleur, to be used with the semi-wireless R8150 groupset released in 2021.

It works with the BT-DN300 battery and EW-SD300 Electric Wire.

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Backward compatibility

This 12-speed front derailleur is meant to be used with a 12-speed road rear derailleur. It will not work with 11-speed derailleurs or MTB derailleurs.

Want to know more about 11-speed and 12-speed compatibility? Read my guide on 12-speed compatibility.

Specifications

Model code: FD-R8150
Series: Ultegra R8100
Weight: 116G
SD300 ports: 1
Total capacity: 16T
Chain line: 44.5mm
Top gear teeth: 46T - 52T

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BT-DN300

Internal Battery

FC-R8100

2x12 Crankset

RD-R8150

Shadow Rear Derailleur (12 speed)

ST-R8150

Rim Brake Dual Control Lever (Wired)

ST-R8170

Disc Brake Dual Control Lever (Wireless)

EW-EC300

Internal Battery Charging Cable

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June 2, 2025Installation Guide

12-speed Front Derailleur installation and adjustment guide

Twelve-speed Di2 Front Derailleurs do not have any limit bolts, so installing the derailleur and setting the limits is different from what you're used to.

April 24, 2025Installation Guide

Understanding Di2 derailleur specifications

What is a rear derailleur's total capacity, really? Why is there a top sprocket minimum? And what about front derailleurs? Chain line, total capacity, Top gear teeth? This page explains all of those, and more.