The microSHIFT Estes Left Thumb Tap Shifter is designed for triple front drivetrains and is compatible with mountain bike front derailleurs. It features an optical gear indicator window that clearly shows your current gear. The shifter offers a solid lever throw with crisp engagement, providing responsive shifting with 11% less force than the previous generation. Its updated composite construction results in stiffer and more responsive thumb levers. Built with improved mechanism durability, it delivers three times longer service life compared to earlier models. This black thumb shifter supports 7, 8, and 9-speed drivetrains. Designed for left-hand use with triple front drivetrains and compatible with MTB triple front derailleurs. Features an optical gear indicator window for easy gear identification during rides. Built with upgraded composite construction for stiffer and more responsive thumb levers. Offers 11% lighter shifting force compared to the previous generation for smoother operation. Durability enhanced with a mechanism providing three times longer service life than standard entry-level shifters.