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@frank9755
Twisted chain links - how do they happen? Presumably it's when a front shift goes bad?
I developed shifting problems on a tour last week. I first noticed that the rear was skipping slightly in the highest couple of gears on a fast descent. Then, I turned a corner in a town and had to change down quickly for a climb.
The front shift worked but, at that point, my Di2 went into crash mode and shifted up at the back, and I had to unclip in a hurry.
I got going again, but, whenever I came to a climb, the pedals would lock and the chain would come off, and I'd have to yank my leg out of the pedal to avoid falling off.
I still didn't realise the problem but, when on the flat, I just couldn't get the Di2 indexed properly at the rear.
Eventually I stopped and had a good look at it, and spotted one link was badly twisted. I had a chain tool and spare quick link so could fix it easily. It then indexed fine and no more issues for a few hundred km home.
But why does this happen? I have had it once before, a good few years ago. This time, when I first noticed the degraded shifting, I'd been riding along for a couple of hours since last stopping with no issues. It seemed to appear from nowhere.