I am pretty new here, and I am not acknowledged with the bicycle terminology in English, so this topic might be a duplicate. Sorry in advance.
So, when I put more pressure while pedaling, the chain over-jumps (some teeth of the gear ring are being missed). Upon observation I think the problem is in the front gear rings (they're 3), but I am not quite sure. When the chain is on higher gear (smaller gear ring) on the back ones - it jumps more that when I am on a lighter gear (bigger gear ring).
Any suggestions what can be the problem and how can I fix this ?
P.S. the teeth on the gear rings seem to be fine and not waster or smth.