Shimano did it right when it came to designing the new Ultegra Di2 wiring setup. It's slimmer and has smaller connectors than the Dura-Ace Di2 system, giving your bike a cleaner look with less messy wiring. You can also run these wires internally or externally, as long as your frame is compatible with internal wire routing. This wire is waterproof and easy to install with the new junction box design. Just plug it up and hit the road.
Compatible with internal or external Ultegra Di2 setups
Ultegra Di2 System requires 1 Handlebar Wire Harness (Nashbar item #SH-EW67AE) and 4 Wires: 1 junction box to front derailleur, 1 junction box to rear derailleur, 1 junction box to battery, 1 junction box to handlebar wire harness
This wire is available in 13 different lengths to fit your specific frame (see Nashbar item #SH-SD50S, SH-SD50M and SH-SD50L for additional lengths)