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Ultegra r8000 indexing conundrum

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Ultegra r8000 indexing conundrum

Old 05-06-18, 09:51 PM
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LKA 
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Ultegra r8000 indexing conundrum

Derailleur/levers: new Ultegra r8000
Cassette: new DuraAce 9100 11-30T
Cables: new

Shifts perfectly in 1st 6 gears from small cog, then hiccups on gear 7 (19T) & won't go to gear 8 (21T). Another click & it goes to gear 9 24T. Shifting is perfect between gear 9 (24T), 10 (27T), & 11 (30T).

Barrel adjust allows it to shift up OK, but then it won't go back down without clicking twice. Barrel adjust back returns it to skipping gears 7 to 8 again.

I am about to concede defeat & seek Yoda.
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Old 05-06-18, 10:05 PM
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Most likely the derailleur hanger is out of alignment. 11 speed really needs the use of a proper hanger alignment tool.
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Old 05-06-18, 10:06 PM
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Align derailleur hanger, you must...
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Old 05-06-18, 10:08 PM
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Thank you. But.....
Interesting side note: Ultegra r8000 replaced perfect rear shifting 105 5600. The front 105 shifter from that gruppo was not working, so I replaced the whole gruppo.

I went from the pan to the fire.
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Old 05-06-18, 10:17 PM
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FWIW: Front shifting is sweet & the cables are out of the way now.
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Old 05-07-18, 10:33 AM
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11 speed is more sensitive to hanger alignment; align the hanger
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Old 05-07-18, 11:55 AM
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Up to 8 speed stuff is relatively resistant to RD hanger misalignment. 9 speed can cause problems, 10 even more likely, while even more tightly spaced 11 speeds can cause problems even with slight misalignment.
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Old 05-07-18, 02:47 PM
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Problem resolved.

Since it was the last thing changed, I swapped out the 11-30T DA 9100 cassette with the previously good-shifting Ultegra r8000 11-28T and without even touching any adjustments, the issue disappeared, gone.

So, not to leave you hanging, I tinkered to see if I could come to a determination of some kind. As it turns out, I was incorrect with the initial tooth count description. It was the 17T to 19T interaction that was faulty. not the 19T to 21T; which is important.

The DA 9100 cassette I have came with cog "17C", whereas cog "17B" is spec'd for the 11-30T cassette in the Shimano dealer manual: going to 19C on the next cog. Hmmm. What adds even more curiosity is that the 12-28T cassette has a 17C-19C combo, indicating that 17C & 19C should work harmoniously. <sigh> Well mine don't. Anyway, it just so happens I have the "17B" cog option from another spare r8000 cassette on hand & I inserted 17B into the 9100 cassette, put it into the wheel & BINGO. No more issues, perfect shifting. Of course, that doesn't explain why my cassette got a 17C, when a 17B is spec'd. My head hurts.....just a little.

I'm glad that bent derailleur hanger was not the cause. The bike is near-pristine & enjoyed perfect rear shifting prior to the derailleur swap, so commentary referring to the hanger was not particularly helpful; but I understand that remote diagnostics based upon an incomplete written description can only get you so far depending upon the issue.

Last note: I converted the 11-30T to 12-30T while I was dinking around since I never use the 11T. Haha, a 1/2 DuraAce, 1/2 Ultegra hybrid: 12-13-14-15-16-17-19-21-24-27-30. Ironically, if the original cassette had just worked, the cool new combo never would have happened.

Thanks for everyone's input.
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