Front derailleur SH FD-R8150 12s 46/53TDS 03015017

Shimano Ultegra FD-R8150 Di2 2x12s - Electronic Precision and Speed
The Shimano Ultegra FD-R8150 front derailleur is a pinnacle of gear shifting technology, part of the 12-speed electronic Ultegra Di2 groupset. It shifts faster than ever – up to 45% faster than its predecessor (FD-R9150) – ensuring lightning-fast response when changing chainrings.
Key Features:
12-speed Di2 system: Electronic shifting provides precise and smooth operation without dealing with dirty or stretched cables. The system is compatible with EW-SD300 cables and the BT-DN300 internal battery (sold separately).
Fast and smooth shifting: The combination of the Di2 platform and Hyperglide+ technology guarantees seamless transitions between chainrings, even under heavy load.
Aerodynamic and lightweight design: With 33% less frontal area and a weight of 116 grams (according to Shimano), this derailleur reduces aerodynamic drag, giving you a competitive edge.
Automatic position adjustment (Auto-Trim): The derailleur automatically adjusts based on the rear chain position to avoid rubbing and annoying noise.
Chainring compatibility: Shimano’s official specification for the Ultegra FD-R8150 covers chainrings up to 52T, but the derailleur has been tested and works smoothly with chainrings up to 54T, making it compatible with the 46/53T combination as well.
Technical Specifications:
Series: Ultegra Di2 R8150
Model Number: FD-R8150
Speeds: 2x12
Mount: Braze-On
Action: Down-Swing
Maximum Large Chainring Size: 52T (according to Shimano) or 54T (according to some retailers)
Total Capacity: 16T (difference between large and small chainrings)
Chainline: 44.5 mm
Chain Angle: 61-66°
Compatible Chain: HG 12-speed
Outer Body Material: Aluminum
Inner Body Material: Steel
Cage Material: Steel
E-Tube Port (SD300): 1
E-Tube Connector (SD300): 0
Firmware Update: Via E-Tube Project
Customization Options: Via E-Tube Project, including Synchro and Semi-Synchro Shift