Recent Di2 issues in the pro peleton

[Calnago]

Still, that's the biggest issue when something goes wrong with your e-shifting. Dead! Clap clap, help me! My chain's fallen and it can't get up!

[AndreLM]

Yeah... That is completely different from a mechanical FD with a broken cable...

[goodboyr]

Here we go again......
Them young whippersnappers and their new fangled gizmos..........

[martinko]

Yeah... That is completely different from a mechanical FD with a broken cable...

Yes, because the chain drops to the lower chainring and you can still pedal.

[Calnago]

A broken cable should never happen at that level because it's an easy visual to pick out during routine mechanical inspections. No, a broken cable comparison doesn't cut it.
And in fairness, ability to pedal on the small chainring only doesn't cut it either; it's a time trial. And because it's a time trial, I would actually prefer to have electric shifting and satellite shifters in both positions, but it still really sucks if it stops working or jams. At least you have a spare bike right behind you (at that level).

[bigfatty]

definitely looks like di2 was the cause of problem.
he was cross chaining it up the rise with 53-28, I hardly think as it leveled out he would be thinking of dropping down to the 39 tooth chainring. It seems as the shifter automagically dropped it down for him. I imagine because it was cross chained and it was trying to stop chain rub so it moved th fd cage in, but this time just a little too far.

[glepore]

It doesn't "try to stop chain rub" when cross chained. It only trims once in the middle of the cassette.

I suspect this was a chainline issue that only revealed itself under heavy load, causing the chain to derail. Just a wag, but it makes more sense than an electronic failure.

[goodboyr]

definitely looks like di2 was the cause of problem.
he was cross chaining it up the rise with 53-28, I hardly think as it leveled out he would be thinking of dropping down to the 39 tooth chainring. It seems as the shifter automagically dropped it down for him. I imagine because it was cross chained and it was trying to stop chain rub so it moved th fd cage in, but this time just a little too far.

Once again, awesome YouTube diagnosis.

[bigfatty]

It doesn't "try to stop chain rub" when cross chained. It only trims once in the middle of the cassette.

Shimano say: Precision actuators move the cage swiftly and smoothly for fast, silent, accurate front shifts every time. And with single-wire E-tube connection to the rest of the system, the front derailleur is able to automatically trim itself as you shift the rear derailleur, eliminating chain rub.

like this picture implies:

[maxxevv]

Chain rub against the derailleur. Only. Period.

[spdntrxi]

Auto trim is not going to send the chain to the inner ring.. It's BS . I run cross chained all the time .. 50/28.. Even 30 with other cassette.

[goodboyr]

It doesn't "try to stop chain rub" when cross chained. It only trims once in the middle of the cassette.

Shimano say: Precision actuators move the cage swiftly and smoothly for fast, silent, accurate front shifts every time. And with single-wire E-tube connection to the rest of the system, the front derailleur is able to automatically trim itself as you shift the rear derailleur, eliminating chain rub.

like this picture implies:

There are two facts I am confident of:

1. You clearly have an agenda.
2. You have no personal experience with the system you have an agenda on.

[glepore]

Agreed. I ride in my52/28 way more than i should with nada issues. Had nothing to do with di2.

I don't know about agendas, but i'll by drinks for anyone that has ever had autotrim derail a chain.

Didn't think so. Di2 isn't perfect but this isnt an issue.

[bigfatty]

agenda?
just sayin' it as I see it, every week their is a fault in the pro peloton that needs a bike swap, that is running Di2.

these faults were never so prevalent before and it is only happening to di2 equipped bikes.

this is not happening with mechanical systems. in fact when faults did happen in the good ole days of mechanical systems, it was so rare , people talked about it for years, ie: schleck.

[bigfatty]

and yes, I did use it once, all but briefly.