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Ultegra Di2, can't get clean shifting by following instructions

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Ultegra Di2, can't get clean shifting by following instructions

Old 11-10-15, 01:47 AM
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Ultegra Di2, can't get clean shifting by following instructions

Brand new Tarmac disc with Ultegra Di2. Rear derailleur shifts fine for the smallest half of cogs (6-11?). For cogs 1-5 there is a slight bit of noise when in the smallest chainring, lots of noise/skipping in largest chainring.

I've followed the Shimano manual's instruction to shift into the 5th cog and press the button on the junction box until the red LED illuminates.
https://si.shimano.com/php/download.p...001-00-ENG.pdf page 52

I follow the instructions to adjust the derailleur up (towards the 4th cog) until it just touches and makes noise, then you're supposed to adjust the derailleur away from the cog by four lever clicks. On the second or third click the junction box blinks red. From what I've read the red blinking LED means you are at the end of the adjustment (32 positions, middle and +/- 16).

From the 5th cog, I can do ~16 clicks and get the derailleur positioned over the 4th cog. Shifting on cogs 2-11 are smooth, but I can't shift to the bottom cog (cause it thinks it is in 1, but the trim adjustment has put it to 2), and the limiter screw prevents it from shifting into a non-existent 11+1 cog.

- - -

Is there any way to reset/recalibrate the system so that it thinks I'm over the middle of cog 5 when I'm actually over the middle of cog 5? Specialized has the goofy SCS hub and inset derailleur hanger, and it looks like all of that is correct/complete (derailleur hanger has the jog in it to move the derailleur in, and eyeballing the distance between the lockring and the face of the dropout looks larger than a normal cassette).
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Old 11-10-15, 09:54 AM
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Perhaps your derailleur hanger needs to be aligned. 11 speed systems are finicky due to the decreased space between cogs...slight misalignment of the hanger can cause major shifting headaches.
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Old 11-10-15, 10:55 AM
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Yep, the symptoms you describe are a bent derailleur hanger.
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Old 11-10-15, 10:59 AM
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Originally Posted by Greenfieldja
Perhaps your derailleur hanger needs to be aligned. 11 speed systems are finicky due to the decreased space between cogs...slight misalignment of the hanger can cause major shifting headaches.
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Originally Posted by nhluhr
Yep, the symptoms you describe are a bent derailleur hanger.
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Old 11-10-15, 02:04 PM
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You note brand new. Are you the original owner? If so take it to the shop where you bought it and let them sort it out....should be under warranty
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Old 11-11-15, 08:29 PM
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Since I'm planning on maintaining it myself long-term, I did want to see if there was anything I could do before returning to the shop. By trimming it to cog 4 I did get a great-shifting ride in with cogs 1-10 before I took it to the shop, and was left with a much better impression of Di2.

But I did get it to the shop today. Unsure if the mechanic had to straighten the hanger, however he adjusted the front derailleur first off. I think he said the idler wheel didn't look like it was lined up with the cogs, though I left it with him at that point.

Bike rode fine up and down the sidewalk afterwards, and the mechanic said there was plenty of room to trim the derailleur now, so I'll assume the problem has been solved.
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Old 01-11-16, 06:57 AM
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I agree with nhluhr. The hanger is bent. A Park Tool DAG-2.2 derailleur hanger alignment gauge and adjustment tool is a handy tool to have around. They are about $70. Hangers get bent by seemingly mild bumps. I have 6870 Di2. I bought and used the DAG-2.2 when I bought and installed the groupset. Shifting is flawless. I dare say that my mechanical Ultegra 6600 SL would have shifted a lot better if I had aligned the hanger.
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