Shimano Ultegra 6870 Di2 Basic Road Electronic Groupset (L)

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This is the Ultegra 6870 Di2 Group Set for road bikes. Included is everything you need to set up your bike with an internal Di2 group. If you have questions regarding compatibility or sizing of the wires, please call our customer service at 1-800-705-2215.

The future of cycling may always be unclear, but electronic shifting seems to definitely be a part of it. Shimano introduced Di2 in 2008 to the world and after revamping it with 11-speed and improved features like cleaner wiring, and internal batteries, it is now proving to be as reliable as it's mechanical predecessors. Those who make the change to electronic groupsets nearly all say the same thing, they will never go back. The fast shifting and lack of ever needing adjustment due to wear on cables are huge reasons, but there are many others.

We stock a complete range of Di2 parts and accessories, but some availability from Shimano can fluctuate. Feel free to contact us with your questions on install and availability.


  • SM-EW90A A Junction Box (3 port)
  • SM-JC41 B Junction Box
  • ST-6870 Shift/Brake Lever Set
  • RD-6870 SS Rear Derailleur (GS Long cage also available)
  • FD-6870 Front Derailleur (Braze On)
  • EW-SD50 E-tube wires (quantity of 5, lengths vary depending on build)
  • TL-EW02 E-Tube Wiring Plug Tool
  • Internal Wire Grommets x 4 (6mm round is included, but 7 x 8mm oval is also available)
  • SM-BTR2-1 Internal Battery
  • SM-BCR2 Battery Charger

    Sizing     Sizing


Small: 46cm-52cm
Medium: 53cm-56cm
Large: 57cm-59cm
XL: 60cm-64cm

Note: E-Tube wires are generally measured to be longer than needed and then coiled into frame to eliminate excess. Since electronic wires do not suffer from performance loss due to this, it allows for easier installation. For this reason, we estimate wire sizes on the long side of what may be needed.  If you wish to choose exact wire sizes based on your actual measurements, (see charts from Shimano above), please let us know.

This product was added to our catalog on February 8, 2016.