The Shimano Ultegra Di2 6770 STI Shifter is specifically designed for road use as it gives you quick and reliable gear changes with Di2 electronic shifting. This STI shifter features a dual control lever for double crank sets and allows you to enjoy fast and smooth gear changes. Coming equipped with an effortless electronic push button shifting mechanism, this model gives you flawless and fluent shifts on the toughest of rides. Shimano has also equipped this version with an adjustable lever reach. This means that you can fine-tune the distance from your handlebar to the lever, so that it perfectly matches your hand size, riding preferences and the terrain conditions.