The Shimano SW-RS801-S puts a satellite shift point right where you need it most — deep in the drops during a sprint or hard climb. Part of the Dura-Ace R9200 Di2 ecosystem, this compact electronic switch plugs directly into the satellite port on your 12-speed STI lever, giving you instant access to upshifts and downshifts without moving your hands from the bar.

Highlights

• Sprint-position shifting: Mount directly in the drops for controlled, precise Di2 shifting mid-sprint without repositioning your hands.
• Dura-Ace R9200 pedigree: Engineered as part of Shimano's flagship 12-speed Di2 groupset for seamless electronic integration.
• Broad 12-speed Di2 compatibility: Works with 12-speed Dura-Ace (R9200), Ultegra (R8100), and GRX Di2 shifters that feature a satellite shifter port.
• Featherweight design: The pair weighs just 6.4 g — negligible system weight for a significant handling upgrade.
• Flexible mounting: Attach with the included clamp band or double-sided tape, then wrap bar tape over the top for a clean, integrated finish.
• E-TUBE PROJECT customisable: Assign custom functions to each switch via the Shimano E-TUBE PROJECT app — shifting, Di2 junction switching, and more.

Installation & Mounting

The SW-RS801-S connects to the dedicated satellite shifter port on the underside of compatible 12-speed STI levers via the included 100 mm EW-SD300 wire. The unit can be secured with the supplied clamp band or with double-sided tape, then concealed neatly under bar tape. Each unit in the pair has one button, which can be independently configured via E-TUBE PROJECT.

Compatibility & Fit

Compatible with 12-speed Shimano Di2 STI levers featuring a satellite shifter extension port: Dura-Ace ST-R9250/ST-R9270, Ultegra ST-R8150/ST-R8170, and 12-speed GRX Di2 levers. Not compatible with 11-speed Di2 systems or 12-speed 105 (R7100 series) levers, which do not have a satellite shifter port. Connects via EW-SD300 electric wire (100 mm included). Sold as a pair.