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di2 question

Old 03-28-18, 01:19 PM
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di2 question

I put a new rear wheel on my road bike and I need to adjust the front derailleur. Ultegra di2. I put it in adjustment mode and when I press either the inboard or outboard adjustment the derailleur doesn’t move, and I get a flashing red light on the J-box. The rear adjusts normally. Both front and rear shift fine I just need to get my front inboard just a hair. Any ideas?
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Old 03-28-18, 02:13 PM
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IIRC, entering adjustment mode is different for front and rear.

For 6870 systems...

To adjust the rear, put the chain on the 5th sprocket as counted from the spokes and then hold the junction A button until the red light glows steadily.

To adjust the front, crosschain big/big and hold the junction A button until the red light glows steadily.

Reference pages 64 and 72 at https://si.shimano.com/pdfs/dm/DM-UL0001-03-ENG.pdf.

Let us know if that doesn't work for you.


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Old 03-28-18, 03:09 PM
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Thanks for that, but I am unclear when the system is in front adjustment mode. Does the blinking LED indicate that you are adjusting the front? I tried that but couldn’t tell if the front derailleur moved. I’m headed back out to the shop to try again. I have set my hi/lo so that is pretty close.
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Old 03-28-18, 03:16 PM
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@TimothyH - yes that worked thanks a million. Earlier I was adjusting on the fly so I bet I was holding it too long and going into crash mode. That and adjusting while riding I probably couldn’t tell if it was actually moving. Now I have the info I need to adjust the rear a little better, it’s not wanting to go into the smallest cog when I’m in the little ring, not that I ever actually use that combo, I just like everything working 100%
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Old 03-29-18, 10:17 PM
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Current generations of Di2 don't let you crosschain small/small with most drivetrain configurations by design. You can trick them if you want by programming the system in eTube project to think you're running a 53/39 chainring and 11-23 cassette if it really bugs you. This will mess up syncro shift.
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Old 03-30-18, 06:58 AM
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Originally Posted by cpach
Current generations of Di2 don't let you crosschain small/small with most drivetrain configurations by design. You can trick them if you want by programming the system in eTube project to think you're running a 53/39 chainring and 11-23 cassette if it really bugs you. This will mess up syncro shift.
The 11-23 cassette is gone from adjustment mode. Seems Shimano discontinued that cassette. But I think you can use a 12-25 or something to get the system to shift to at least the 13. You also need to turn off Gear Position.
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Old 03-30-18, 07:55 AM
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Originally Posted by MikeOK
@TimothyH - yes that worked thanks a million. Earlier I was adjusting on the fly so I bet I was holding it too long and going into crash mode. That and adjusting while riding I probably couldn’t tell if it was actually moving. Now I have the info I need to adjust the rear a little better, it’s not wanting to go into the smallest cog when I’m in the little ring, not that I ever actually use that combo, I just like everything working 100%

Glad you got it sorted out.

It is easy to tell that it is moving in the relative quiet of a garage while sipping coffee but a touch more difficult in the heat of battle out in the field. It still beats carrying a screwdriver and the good news is that once you get it 100% it is likely to never need adjustment again.

I actually have a Di2 mode cheat sheet printed and taped to the inside lid of my toolbox. I also have a torque spec cheat sheet which I laminated and keep in the top of my toolbox.


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Old 03-30-18, 08:13 AM
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Mine worked perfectly the first 3,000 miles in all 22 gears before I put on a new rear wheel. I didn’t have to touch it, not one single time. But since I moved the entire group to my new frame it’s been a little finicky going into the small cog while in either ring, and especially so after I put on the new rear wheel. I’ve only charged it 3 times, and each of those it was at 50%, so if I were to let it run all the way down a charge would last ~1800 miles. I would never use little ring/little cog but I do occasionally use big ring/little cog.
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