Righto, i’m a bit confused.
12 speed set up.which I’ve never really got on with. Always something.
Anyhow, this time it’s quite weird. Bike is fine in the stand, goes through the gears fine. When i am on the bike however, when i put power down i hear a strange ppr-ppr-ppr noise 🐈 and i can feel vibrations through the pedals. Seems to happen on the drive side. Almost like the chain is rubbing on the bottom jockey wheel.
It is not the chain length, the chain is routed correctly, i have played with btension, clutch tension, changed to a new mech, checked the mech hanger is straight. I’m at a loss for ideas!