UTE

same exact break happened today on standard rings, Ultegra Di2 after 3 years and 25,000 miles. Luckily within 200' of the car. Of course out of warranty. Disconcerting that this can happen without warning it seems at any time

Rogus

Same exact thing happened to me today. Standard Ultegra setup. Thought at first there was a battery issue since the battery is 5 years old with heavy use and it was still shifting fine in the rear. Having charged the battery two days ago, it didn't seem likely as the indicator light was green. Found the problem upon getting home and checking it out. Still having the rear, it's not like the bike can't be ridden, but definitely makes me rethink my scheduled ride for tomorrow.

Having read the previous posts no one said anything about the part being replaceable. I guess that means new derailleur.

UTE

Yes, new derailleur required, it's not cheap

Rajflyboy

As much as this stuff cost it should be bulletproof

Rogus

Wouldn't that be nice. Newer model has been redesigned and hopefully will be stronger.

KroneyBJ

hi...i was thinking the same, it looks like it could be soldered/welded....Anyone have any luck trying this? Today my FD6870 also snapped in the same place, from metal fatigue i think. Am running regular chainrings

79pmooney

My (rather simplistic) thoughts - when I am riding slow and shift, I ease the lever (friction old school) instead of a racing fast move. I don't just pull the lever back fast and force the chain to do things it doesn't want. At 90 rpm that isn't an issue. I do the same in back. I'll happily slam the lever back at the bottom of the hill while I still have speed but later, I'll go by feel as to how fast the chain can climb the cogs.

Sounds like the system needs a feedback loop.

Edit: sounds like the big-big combo and not enough chain slack. No problem if you remember that is a no-no but in the brain fog of the top of a hard climb it is easy to pull the shift the wrong derailleur first. So, brains or a fail-safe for when those brains aren't working. (Big-big - a few extra chain links.)

rsbob