The Shimano Ultegra Di2 RD-R8050-GS brings the precision of electronic shifting to serious road riders in a refined, medium-cage package. Supporting cassettes up to 34T, it offers a wider gearing range without sacrificing the crisp, instant response that Di2 is renowned for — making it equally at home on rolling terrain and extended climbs.

Highlights

• Shadow RD design: Low-profile geometry tucks the derailleur beneath the cassette, reducing snag risk and protecting alignment after impacts.
• Shimano Di2 electronic shifting: Motor-driven precision delivers fast, accurate, and consistent gear changes at the press of a button — every time.
• Synchronized Shift support: Full and Semi Synchronized Shift modes allow intelligent front/rear coordination through a single shifter input, reducing rider workload on technical terrain.
• Medium cage (GS) capacity: Handles 11-28T through 11-34T cassettes with a total chain wrap capacity of 37T — ideal for compact and standard double chainring setups.
• Shorter throw geometry: New R8050-series geometry enables shorter, faster shift strokes for snappier, more precise gear transitions.
• E-TUBE compatible: Connects to Shimano's E-TUBE Di2 ecosystem for customisation of shift modes and button mapping via the E-TUBE Project app.

Ultegra Di2 R8050 Series

The R8050 Ultegra Di2 groupset sits one tier below Dura-Ace in Shimano's road hierarchy and shares much of the same electronic shifting DNA. The RD-R8050 was redesigned with updated Shadow RD aesthetics and geometry inherited from top-tier Dura-Ace, delivering a derailleur that feels premium in both performance and appearance. For riders who want Di2 reliability without the Dura-Ace price, the Ultegra Di2 RD-R8050-GS is the benchmark choice.

Compatibility & Fit

Designed for 11-speed Shimano Di2 road drivetrains. Compatible with 11-28T to 11-34T cassettes (maximum low sprocket 34T, minimum top sprocket 11T). Maximum front chainring difference of 16T. Total chain wrap capacity of 37T. Supports compact and standard double chainring configurations. Requires Shimano Di2 junction box and E-TUBE wiring; not compatible with mechanical shifting systems. Direct attachment mounting.