Originally Posted by
Iride01
How old is the bike, or better yet, how many total miles do you think is on it. Though everything else in your pics looks nice, clean and almost new, the pulley wheels in your video looked a little worn... maybe, to hard to really tell. So if they are worn, then that might be the reason for the skip.
Or if that is the old chain on the bike, then it may be worn and stretched (so to speak) and that might be why it is skipping on the pulley wheel.
It's pretty easy to measure a chain to see if it's worn. Put a metal scale next to it and see if the 12 inch mark falls on the same part of the pin as the 0 mark is. If that part of the pin is a 1/16th beyond, then the chain is at or near replacement time depending on your preferences for replacing chains and whether you want to limit how often the cassette and rings need to be replaced.
Thanks for the reply. The chain is very new according to the seller, and looks it. Measures up fine as well. Seems to be more about the angle the chain enters the cage than anything. I took the rear derailleur apart and cleaned a lot of crap out, but it's not helped. The jockey cogs seem to have a fair bit of life left in them.
Originally Posted by
ThermionicScott
^ Perfect, that's exactly what I had in mind. The outer end of the pulley cage looks like it's bent outward to me. Switching to the other chainring and going through the gears will help determine whether that's in the hanger or the derailleur itself.
I also find that turning the cranks helps to focus on the path the chain takes.
Yes, I think this might be the cause. Could you explain how switching chainrings and going through the gears will help determine whether it's the mech or the hanger? I'm afraid I haven't dealt with this kind of issue before.
Thanks again for the help.