Originally Posted by
79pmooney
How old are those chainrings? Are the teeth worn to sharp points instead of coming up close to parallel then squaring off. New chain, old chainrings? It looks like the teeth are picking the chain up (actually not releasing it). A new chain will have a much tighter pin to pin distance than the distance between worn teeth.
Ben
That doesn't make a big difference because the teeth stay in the same place. Although, often with wear, the pulling end of the tooth is angled upward so the chain is forced to ride high, which then makes the chain seem short.
Teeth can wear unevenly (I now periodically rotate my chainrings).
I use an old Campy Nuovo Record (SR?) era chainring with 9spd without problems, and now even using a Campy 9s chain.
The first thing I'd do is to physically measure the chain. How old is it? New? Used?
A tight link can create a periodic hop, but not necessarily continuous hopping. Anyway, worth looking at.
Those teeth don't look bad. Maybe a little elongation of the slots, but not too bad.
As a test, you could try flipping the inner ring around backwards and see how that affects it.