Shimano Dura-Ace Di2 Electronic Front Derailleur

Shimano Dura-Ace Di2 Electronic Front Derailleur:
Watching the Di2 front derailleur work is watching magic before your eyes. A self trimming front derailleur? That's exactly what the Shimano Di2 front derailleur is. It is powered by a servo motor which moves the derailleur, hence moving the chain to the big or small ring. But the amazing feature is the auto-trim.

The first time you see it you'll do a double take. Did that front derailleur really just move over as you shifted into the smaller cogs of the cassette? You'll do it again just to make sure you saw it for real. The front derailleur auto-trims and eliminates any and all chain rub! That's right, automatically.

Now is that the only remarkable thing about the Shimano Di2 front derailleur? Not at all! When you shift into a different ring the front derailleur overshoots the shift and then once the shift is complete centers itself to avoid dropping the chain over the big ring or into your bottom bracket shell! Fast, crisp, without any noise or effort. Digital Integrated Intelligence at it's finest.

Specifications:

Programmed, electronic motion

Requires the front derailleur wiring kit

Braze-on

122 grams

Shipping Weight: 1.5 lbs.