I have a tad over 28,000 miles on my Red eTap drivetrain. I regularly check the chain for wear and replace and it reaches the .5 mark. But how do you know when the chainrings and cassette should be replaced? I regularly clean everything and over the winter I use a ultrasonic cleaner to get everything really clean.
Over last winter I got a great deal on new chainrings, chain and cassette and set them aside. This weekend I checked the chain and it was time to be replaced. Today I went for a ride and found the chain skipping occasionally when in the 5th cog (19 teeth), which is the one I ride in mostly. It happened in both the 50T and 34T, but not in any of the other cogs.
I went ahead and replace the cassette and it works perfectly, so I guess it was a sign from above.
I just find it odd that the skipping didn't happen with the worn chain.
My old cassette after being cheaned.
