Best price Shimano Dura Ace 9070 Di2 11 speed
Best price Shimano Dura Ace Di2
What does Di2 stand for?
Di2 stands for digital integrated intelligence. The electronics do all the changing for you at the click of a shifter button. The changing is smooth and slick, with clean gear changes. A neat function is that the system auto calibrates itself so that it’ll never need tweaking as cables stretch and wear.
The front derailleur also adjusts itself according to the position of the rear mech, so there’s never any overlapping or chain rub. This auto trim function helps with gear changes under various conditions and in a race situation, could give you a significant time advantage.
Di2 electronic shifting is available on both the Dura Ace and the Ultegra range.
Be aware that the Ultegra range is less expensive but most people comment that they feel the same. Dura Ace is lighter in weight, but not likely to last as long.