Ultegra 6870 di2 dropping chain

Discuss light weight issues concerning road bikes & parts.
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raggi
Posts: 43
Joined: Thu Mar 02, 2017 2:43 pm

by raggi

Hi,

Recently I've been having a problem with my di2 setup where if I'm in the big ring (52/36) and one of the easiest gears in the back (11-28 cassette), when I then shift to a harder gear in the back, the chain seems to end up in this weird limbo between the front chainrings, where it's hopping up and down and it won't stop until I shift again at the front..

It feels to me like it has something to do with the automatic trim of the FD but I'm not well versed enough to pinpoint the issue.

I'm using Quarq DZero cranks with old(ish) Specialized chainrings.

Anyone had this happen and/or knows of a potential solution?

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havana
Posts: 352
Joined: Tue Jan 09, 2007 5:04 pm

by havana

I had a similar problem. Read the manual and adjust the auto trim function.
Most "innovations" in cycling are solutions for non-existing problems.

raggi
Posts: 43
Joined: Thu Mar 02, 2017 2:43 pm

by raggi

Tried fiddling with adjusting the trim and I'm fairly certain it's spot on now, I am however, still having the same problem.

The same thing has also started to happen sometimes when I hit a particularly rough & bumpy patch of road.. Could it be something to do with either the angle of the FD, or that the chainrings are bent/worn out?

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nycebo
Posts: 49
Joined: Fri Nov 13, 2009 8:04 pm
Location: New York, NY

by nycebo

raggi wrote:Could it be something to do with either the angle of the FD, or that the chainrings are bent/worn out?


If you haven't tried to straighten your RD hanger, I suggest that be the first place you start.

kode54
Posts: 1184
Joined: Tue May 23, 2006 9:39 pm

by kode54

raggi wrote:Tried fiddling with adjusting the trim and I'm fairly certain it's spot on now, I am however, still having the same problem.

The same thing has also started to happen sometimes when I hit a particularly rough & bumpy patch of road.. Could it be something to do with either the angle of the FD, or that the chainrings are bent/worn out?


if it jumps off while hitting bump...could be that the chain is too long and not enough tension. i've had that happen once when i shifted going into a turn, while hitting bump.
- AX Lightness Vial EVO D + DA9150 + Enve SES 3.4 carbon hubs
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