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@JonD
Grinding sounds and rear derailleur pulling forwards on each pedal stroke under pressure. Has been around for a while, getting worse to now where I need to deal with it.
This happens in any/all gears, but only under load. Just spinning on flat there is nothing. Start up a hill and put more pressure on the pedals, grinding on each pedal stroke and I can see the rear derailleur pulling forwards from the lower jockey wheel. I can’t replicate in a stand. Was happening with old chain between 0.75 and 1% stretch, so swapped it and it’s still happening with new chain. Chainrings or cassette don’t look worn. I have lubricated and cleaned up the derailleur.
There are no other issues, changes gear perfectly, does not skip over teeth under pressure, no undue looseness anywhere else on the bike.
Do I need a new rear derailleur? New cassette? Any other thoughts?