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  • The problem is that it was very hard to even start pedaling from still position or to pedal in any uphill. With the new chain and new crankset it is definitively better but still problematic. Until few months ago I could bike very fast applying a lot of power to the pedals, but not anymore. I will try first replacing the chainrings, but if this will not fully solve the issue then I will have to look into replacing the derailleur. I really hope not. I am not even sure which shimano model could I now mount in my bike since the original one is too old and will be not easy to find in stores. Commented Nov 24, 2024 at 13:49
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    @spanito Ted's advice is solid. Did you test the behaviour in the different chainrings? The large doesn't look too bad, the middle is badly worn, and the smallest quite alright from the little that is visible of it. An ounce of correct diagnosis >> unlimited pounds of the wrong cure. Commented Nov 24, 2024 at 17:09
  • Yes, when the bike is moving I get a lot of chain skipping for both middle and large chainrings. The smalles is similar to new because I use it extremely rarely and I don´t have the skipping problem. If I put all my weight on the pedals with the bike still (using the brakes) then there is no skipping. Do you think this is a sign of issue with rear derailleur? I am of course willing to replace it if the problem is not solved also with the new chainrings, but what derailleur model would you suggest from shimano that is compatible with 9 speed cassette? Commented Nov 24, 2024 at 17:57
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    @spanito In that case, skipping in 2 worn rings and not the smallest, it sounds like the problem is in fact the chainrings. I would not worry about the deraileur before you have tried swapping those rings. It's a matter of preference (price, availability, needs), and shimano has a ok compatibility chart. productinfo.shimano.com/en/compatibility/C-433 Commented Nov 24, 2024 at 18:25