Originally Posted by
dukes909
How close to needing to be replaced are these chainrings?
Hard to tell, just like that.
I prefer to put a length of new chain on, and then try to lift it a little.Let's say I have a 3/4 of chain wrap, with chain hanging down on both left and right. If I then can "get air" between the chain and ring when lifting a little at the top, I might consider replacement. The profile as such doesn't look too bad to me.
Originally Posted by
dukes909
what's up with that tooth in the middle chainring that looks like it's been sawn off?
Well, either it's tooth that's sheared off at a clumsy gear change sometime, or it's a deliberately trimmed tooth to improve shifting.