The Shimano Dura-Ace ST-R9150-R is the right-side dual control lever for Shimano’s Di2 electronic shifting system, designed for 11-speed road drivetrains on drop bars. It handles electronic gear shifts via E-tube wiring while operating mechanical rim brakes through traditional cable actuation. Riders building or upgrading high-end road bikes with Dura-Ace R9100/R9150 series components use this shifter, as it integrates with compatible front derailleurs like FD-R9150, rear derailleurs, and 11-speed cassettes or chains such as CN-9000 or CN-HG701-11.

Choose it for consistent shift response under load during sprints or climbs, where electronic actuation delivers quick multi-shifts programmable via E-Tube software. The carbon lever body and hoods reduce weight compared to alloy alternatives, and the ergonomic hood shape with reach adjust suits long rides or smaller hands. It mounts to 23.8-24.2mm handlebar diameters, but requires a matching left shifter (ST-R9150-L) and Di2 system battery/derailleurs for full function. Limitations include no hydraulic brake support—use ST-R9170 for discs—and compatibility only with Shimano 11-speed Di2 components.