The Shimano Ultegra ST-R8170-R is a right-hand electronic brake and shifter lever designed for road bikes with 12-speed drivetrains. It integrates wireless Di2 shifting with hydraulic disc braking using Shimano’s SERVO WAVE technology to provide smoother and more modulated braking performance. This lever pairs with the R8170 hydraulic calipers and supports both wireless and wired connections. Constructed from aluminum and carbon fiber materials, it features an ergonomic design with raised hood peaks for improved comfort based on professional rider feedback. It accepts satellite shifters for additional control options. The lever’s compatibility extends to Shimano’s R9200-series satellite shifters via SD300 Di2 wiring ports, ensuring system expandability. It weighs approximately 196 grams, balancing durability and responsive control. This shifter is suited for cyclists seeking precise electronic gear changes combined with effective hydraulic braking in a refined road bike cockpit setup.