Thursday, March 1, 2018

Canyon Endurace: Customizing Dura-Ace Di2

After waiting patiently, the time has come. I have finally gathered all my Dura-Ace components that will be installed onto the Canyon Endurace. Before that, I will connect up all the Di2 components to test it out, before installing it. At the same time, I will take the chance to update and customize the Di2 components. In this new generation of Di2 components, there are some new features that I have not tried before. Let's check it out!

Full Dura-Ace R9170 groupset! Hydraulic disc brakes with Di2 electronic shifting.

The new EW-JC130 Di2 wire with a Y split junction. This comes in 3 different lengths, and is designed for internal handlebar routing.

Just for future reference, this Y split Di2 wire weighs just 8 grams

Wireless unit EW-WU111, which installs inline along the Di2 wire route, and is much smaller in size compared to the previous version SM-EWW01.

Super light at just 3 grams

The Y split Di2 wire is used to link the two Di2 shifters together, and connects to the inline wireless unit.

As you may have noticed, this is not the usual wiring layout that is used on road bikes. Normally, there are two separate wires that link the two shifters to Junction A, which resides underneath the stem. From there, a long Di2 wire then links Junction A to Junction B, which is usually at the bottom bracket area.

However, I wanted to hide Junction A instead of having it underneath the stem. Hopefully, this will give a cleaner wiring layout. If the handlebar was suited for internal wiring (with holes for Di2 wires to enter and exit), I would have got the Junction A for drop bars (EW-RS910), but since the stock Canyon aero handlebar cannot run internal wiring, this is the next best solution.

The custom Di2 wiring layout that will be used on the Canyon Endurace

In this custom layout, Junction A will be located at the seat tube area, and wired in between the front derailleur and Junction B. As this is not the officially recommended layout, I had to test it out before installing it on the bike.

Junction A which comes stock on the bike. The bracket on the left is the original one from Shimano, while the one on the right (with countersunk hole) is a special one designed by Canyon to mount Junction A under the stem.

Junction A with original bracket and rubber strap. Weighs 13.5 grams.

Di2 internal battery, with a custom bracket designed by Canyon to mount it inside the downtube of the frame. Weighs 62 grams including the bracket.

Junction B as it comes stock with the bike. Wrapped up in foam tape to prevent it from rattling inside the downtube.

Weighs about 6 grams with the foam tape

All the Di2 wires that will be used on the bike. About 36 grams in total.

Note that almost all the Di2 wiring is already present as the bike came stock with Ultegra Di2. Since I am reusing the Di2 wires, Junction A and B and also the internal Di2 battery, I can also see how it was mounted from the factory.

Wiring up everything to test it out. It works perfectly! The Garmin Edge 510 has also been connected to the Di2 system using the wireless unit.

Using the SM-PCE1 PC Linkage Device to update and customize all the Di2 options

With the new Di2 internal battery and the latest firmware update, synchronized shifting is now possible!

As shown above, there are two synchronized shifting modes available. Semi-synchronized shifting mode means that when you manually shift the front, the rear will automatically move up or down to compensate for the big gear jump at the front.

As for full synchronized shifting, it means that only one shifter is needed. As you shift along the rear cassette, it will reach a point where the front shifting will occur automatically, and at the same time, adjust the rear derailleur to ensure that the next higher or lower gear ratio is selected.

Gear mapping for full synchronized shifting mode.

Looking at the green and blue arrows, you can see that the shifting points are different for upward shifting and downward shifting. These shifting points can be changed as you like, making it truly customizable for the individual.

With this full synchronized shifting mode, you can get 14 distinct gears out of this 2x11 speed drivetrain, using just a single shifter.

These are interesting modes of shifting which I can try out, after I have installed the components onto the bike.


  1. Thinking about building something along the same lines. two Q's put into my mind:

    A. Why are you in need of junction A ? (to charge the battery).

    B. Since you don't have a "control box" in your system, can you do basic adjustment via the Garmin Edge 510 ?


    1. Junction A is necessary for this Di2 system. One is for charging, especially since it is internal battery. Another reason is that there is a button which you need to enter adjustment mode, or to change between synchronized shifting. It also indicates battery level.

      As for adjustment, just press the button on Junction A and do the usual adjustment. Or link up the system to your PC or smartphone and there are more options to play with.

  2. I just received my Ultimate CF SLX 9.0 Di2. Was fully expecting the mode switch to be on the right bar end. Can you save me some head scratching and point me in the right direction to the sychro mode switch? All of the supplied documentation is a bit utdated, which isn't great when you're completely new to Di2 (and most of the other awesome tech on this machine)...

  3. Where exactly did you mount the Junction A?

    1. I mounted it at the downtube area, as you can see from this post.

  4. How difficult is it to fix that battery? Crank needs to be removed?

    1. Yes both crankset and bottom bracket needs to be removed if you need to access the battery.

    2. Can that battery be relocated to the seat tube?

    3. You can install the internal Fi2 battery in a seatpost instead. However, you will not be able to use the included VCLS suspension seatpost as it is not hollow inside.

  5. Thanks for the help. If I decide to shift the battery, how does the wiring come from the downtube across the BB to the seattube? Is there space around the BB?

    This is the reason

    1. Yes there is space around the bb, you can route the wires inside the frame easily.
      If you install the battery inside the seatpost, you can remove it easily. The other way is to use an external battery instead where you can remove it easily.

  6. Hi, where did you get the bracket for the battery?

    1. The battery bracket comes with the Canyon bike, and there is a special mounting point inside the frame downtube to match this bracket.


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