Shimano SW-R600 Right Shifter Switch

Exclusively designed for climbers because it allows riders to shift without their hands leaving the top of the bars. An intuitive thumb operation comes via the small unit, located near the stem on the right side of the handlebars. Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold.
The SW-R600 allows you to change gears cleanly and quickly and is great for those who race because you can shift before launching that decisive attack.