The Shimano Ultegra FD-6770-F is a Di2 front derailleur designed for 10-speed road bike drivetrains with double chainrings. It features a braze-on mounting type and is made of aluminum, weighing approximately 165 grams. This component is built for precise, fast, and smooth shifting with electronic control, eliminating cable stretch and wear. It supports chainrings ranging from 50 to 56 teeth with a maximum difference of 16 teeth and operates with a chain line of 43.5mm. The derailleur auto-trims to maintain optimal chain clearance, preventing chain rub and improving reliability. Intended for riders upgrading to electronic shifting or seeking reliable, quiet front shifting performance, it’s compatible with Ultegra 6770 Di2 groupsets but not with triple chainring setups or 11-speed Di2 systems after firmware updates.