Originally Posted by
NoWhammies
[MENTION=487236]jadocs[/MENTION] The chain is, according to my chain wear indicator, at 50% life. The rear cassette is OEM, so I am hoping to get another chain life out of the cassette before replacing it. That said, the cassette has been making some strange noises of late, so I am thinking the casette may be coming to the end of its life. Although to look at it, I don't see any shark tooth happening.
I cannot recall if the occurrence happened in a gear that I use all the time. I'll give the bike a look over on the stand to make sure everything is running properly after dinner tonight. Will give me something to do as the sun goes down.
Keep an eye on it. I’m thinking that possibly it happened in a gear that you are in most of the time in combination with a slightly worn chain (even though it’s still within the spec range). It has happened to me, but it just felt like a skip...it did not make a huge racket afterwards though. I switched chains just to see what would happen and it has not happened since.
Not saying this applies to you: One thing I have learned observing some of my buddies who also have Di2, is stop messing with it. Set it properly per tech manual. By that I mean, they have experienced a slight delay when up shifting (ie. not as crisp as they think it should be...a little racket before it finally engages), and they end up “tweaking” it. When that happens the pulley wheels end up not being centered properly...and that can cause skipping as well. I really think that a worn gear plus a slightly worn chain causes some of the delay/racket when trying to upshift to it.