Squeak from rear derailleur area

deer_dance

Wondered if anyone could suggest a possible cause for the following...

- squeak/chirp noise coming from rear derailleur area while pedalling

Have tried...

- a different wheel from another bike (including different cassette/QR)
- servicing jockey wheels
- replacing entire rear derailleur (inc jockey wheels)

These had no effect.

I did earlier try replacing the chain. This stopped the noise for a couple rides at the most before it returned.

Any clues?

fudgey

Have you tried lubing your pedals? Mine squeak if i dont give them a splash of gt85 now and again.
It could be the seat post, or seat, or BB.

If you have swapped everything else on the rear id say its not any of those things.

g00se

If the squeak is in time with crank rotations, check the chainring bolts are tight.