The Shimano SW-RS801-T is a pair of compact satellite shifters designed specifically for use on the tops of drop handlebars, often called the “Climber’s” shifter. These shifters integrate a 260mm cable and connect directly to compatible Shimano 12-speed Di2 Dual Control levers via the SD300 type port, enabling precise and ultra-fast electronic shifting. Each shifter weighs approximately 5.9 grams, making them ultra-lightweight additions. They are intended for cyclists who want to add custom shift points on the tops of their handlebars for easier gear changes during climbs or varied hand positions. Installation attaches via a clamp and zip tie, designed for both road and gravel cycling.

The shifters are only compatible with 12-speed Di2 levers that feature the satellite shifter port (SD300) and will not work with Shimano 105 Di2 levers or other non-compatible ports. The integrated cable and seamless wireless transmission improve responsiveness and reliability, offering a very precise shifting experience in demanding cycling conditions. This product suits riders looking for ergonomic shifting options beyond standard lever locations, particularly useful for long or steep climbs where hand position adjustment is beneficial.