Shimano Dura-Ace Di2 Electronic Sti Levers

Shimano Dura Ace Di2 Electronic STI Levers:
The driving force of the entire electronic groupset is Shimano's Di2 electronic STI levers. You can call it the mother board or the brains of the entire component group.

Unlike mechanical shifting which requires you to push the lever inward Shimano's electronic Di2 levers takes about as much effort as pushing a button on your keyboard. No involvement of your wrist or forearm. No strength required. In addition, the sleek profile is extremely ergonomic and fits comfortable in your hand, in part to the absence of unnecessary cable routing.

The Di2 lever has two uni-directional cabon fiber shifter blades. The closer one to the handlebar shifts to smaller cogs in the rear (right STI lever) or into the big ring in the front (left STI lever). The farther paddle does the opposite. The paddles are also the location where you will be able to fine-tune your derailleurs and adjust them. That's right, no barrel adjusters! They are now intergrated into the paddles themsevles and tuning your derailleurs could not be simpler. Just get into your 15 tooth cog and by pressing either paddle till the chain makes no noise you'll be adjusting the shifting for the entire rear derailleur. Simple, clean. A new age of shifting.

Once set up the entire shifting could not be smoother. No cables means no friction. That means completely smooth shifting without any unnecessary mechanical drag!

Specifications:

Programmed, electonic motion

Compatible with only Shimano Di2 components and Dura-Ace 7900 brakes.

254 grams

Shipping Weight: 3 lbs.