The Shimano Ultegra ST-6770 left shifter is an electronic Di2 shifting lever designed for 10-speed road bikes. It replaces mechanical cable shifting with precise electronic push-button controls, offering smoother, effortless gear changes. This left shifter controls the front derailleur and features an ergonomic aluminum construction with a gray finish, fitting seamlessly with other Ultegra 6770 series components. Its ergonomic hood shape and lever reach adjustment cater to a wide range of hand sizes, enhancing comfort during long rides.

Weighing approximately 160 grams, it is lighter than its mechanical predecessors, contributing to a well-balanced bike setup. The shifter is part of the Ultegra 6770 series, compatible primarily with 10-speed Di2 electronic drivetrains, and is not backward compatible with earlier generation wiring kits, but shares wiring compatibility with second-generation Dura-Ace Di2 systems. Ideal for riders seeking reliable electronic shifting with straightforward installation and integration into a 10-speed Ultegra Di2 setup, it also supports programmable functions for expanded usability.