Inner Chainring rubbed on frame.. but its not close?

[Yellow Saddle]

Damage like that is usually caused by chain-suck.

Quote:

WHAT IS IT ?​

‘The chain fails to disengage from the bottom teeth of a front chain-ring ; instead the teeth carry it up and around the full circumference of the ring, to wind back onto itself, and to jam between the chain-ring and chain-stay. Because it usually occurs during forceful pedalling, the chain can become permanently twisted, teeth can be damaged, and chain-stays of aluminium or carbon-fibre also damaged by the chain being wedged hard against them.’

I find it’s most likely to occur when the large chainring is worn and the teeth wear into a hook shape (shark fin).
Helicopter tape can help protect the chainstay to some extent.
View attachment 774322

Whilst that is a beautiful example of a worn chainring, that particular ring will not cause chainsuck. It has worn past the suck point. A chainsuck ring will have right-facing tips. Imagine a shark swimming to the left of the picture and its dorsal fin looks lime a C you form with your left hand.

The whole image is not available, but I suspect that particular ring suffered from cross-chaining, making the teeth thinner and eventually they succumb to high torque by forming those burrs you see.

 

[Danielaaron94]

Alright so I see people get frustrated when you don’t respond timely to their answers… either way I appreciate the responses.

No I do not believe it was chain suck. The chain rings are in good condition. I believe the damage happened before I owned the bike, it’s all good. I’ll just be careful in the future.

 

[Danielaaron94]

In his first post before editing it, the OP stated he had bought the bike second hand and was/is asking how the damage could’ve happened. Answer: it could’ve happened when the previous owner had a chain-suck incident, with old worn chainrings that are no longer fitted, or possibly with those pictured.

Correct, I have no idea if the chain ring has been replaced, I didn’t have that kind of knowledge when I purchased the bike. You live and learn!

 

[Ajax Bay]

Alright so I see people get frustrated when you don’t respond timely to their answers… either way I appreciate the responses.

This is not frustration - glad to see you return to your thread.
Please take my comments below in a general sense: this is not about 'you'.

Several have the knowledge to answer questions like yours but are deterred from making the effort if the originator (often this is a 'first post') never returns (or appears never to return (logged in)) to see the answers/comments.
Of course this is 'cycle chat' so the chatting objective is acchieved whether or not the OP returns.

You asked this Q (OP) on 26 May. And returned (prompted by my comment on your other Q/thread) on 13 June: 18 days.
"timely" I appreciate peoples' tempos and 'lives' vary but, on the assumption you wanted to know the answer to the Q, that 'flash to bang' time is long, and easy to infer that you are asking a Q and not interested in the answers.

Same for the other thread (same bike), but you only took 6 days to return, for an issue which was adversely affecting your riding.
https://www.cyclechat.net/threads/campagnol-bad-shifting-on-second-hand-wilier.303198/#post-7434983