The Shimano Ultegra Di2 FD-R8150 is a 2x12-speed electronic road front derailleur that brings Shimano's flagship Di2 shifting to the Ultegra tier. It shifts 45% faster than the previous generation, weighs just 110 g, and has a 33% smaller frontal area for cleaner aerodynamics — fast, precise front shifts in any condition.

Mount & compatibility: This is a braze-on front derailleur that bolts directly to a frame with dedicated braze-on bosses. For clamp-style frames, add Shimano's SM-AD91 band adapter (sold separately). It is a 2x (double) derailleur for Shimano 12-speed road Di2 drivetrains (Dura-Ace R9200, Ultegra R8100, 105 R7100 Di2) — it does not work with 11-speed or mechanical systems.

Key Specifications

• Model: Shimano Ultegra FD-R8150 (R8100 series, Di2)
• Type: Front derailleur — electronic (Di2)
• Speeds: 2 x 12-speed
• Chainrings: Double (2x)
• Mount type: Braze-on (SM-AD91 clamp adapter sold separately)
• Style: Down-swing
• Max chainring: 54T (supports up to 55T) · Capacity: 16T · Chainline: 44.5 mm
• Chainstay angle: 61–66°
• Shift actuation: Electronic (semi-wireless Di2; connects to battery via EW-SD300 wire)
• Weight: 110 g (3.9 oz)
• Color: Black/Silver

Technology Highlights

• 45% faster shifting than the previous generation — fast, seamless front changes.
• Aero, low-profile design: 33% smaller frontal area reduces drag at the center of the drivetrain.
• Semi-wireless Di2: Wireless shifter signal; derailleur powered via the central battery for consistent, cable-free front shifts.
• Wide chainring support: Optimized for 50-34, 52-36, and 54-40T road/CX combinations, up to a 55T ring.

Who It's For

Road and all-road riders building or upgrading a Shimano 12-speed Di2 drivetrain (Dura-Ace R9200, Ultegra R8100, or 105 R7100 Di2) who want fast, light, precise electronic front shifting at the Ultegra price point.

What's in the Box

• 1 x Shimano Ultegra Di2 FD-R8150 front derailleur (braze-on)
• Fixing bolt & support bolt
• Shimano documentation

Condition & Shipping

• Condition: Brand new in retail packaging
• Ships from: Ontario, California (US domestic)
• Estimated delivery: 3–5 business days
• Returns: Free 30-day returns