I've got an annoying creak, and I've been through everything I can think of to track it down - I'm hoping I've missed something.
This is on my Canondale Topstone road/gravel bike. It's an alloy frame with an FSA Omega screw-in BB and self-extracting cranks, otherwise a 105 drivetrain.
On every right pedal stroke, there's a creak, if there's any force at all. It's not detectable on the stand, whether or not there's a chain installed (maybe a hint if I try to hold the brake on to give some resistance?), and it's not detectable if I pedal while the bike descending fast enough that I'm spinning the pedals but the bike is really freewheeling. The volume seems pretty constant, except that it's louder in the big ring. In the little ring there's a hint of it on the left stroke as well. The pedal position seems consistent at the top of the downstroke, say around 1 o'clock. It's hard to hear except in quite conditions, and on the very smoothest of surfaces (i.e. rarely) I think I can feel it through the pedals.
I've changed the BB. On checking, one of the cartridge bearings was loose - not in the race but between the race and the crank, so I replaced the whole BB. It's not loose any more. I thought this fixed it back in March but my test ride must have been too noisy - either that or it went away for days; either way I've checked the cranks and BB again recently - no play.
It's exactly the same when I get out of the saddle (I had a saddle-bolt related creak on the same bike).
Swapping pedals and wheels didn't stop it (I run M520s for road, but put some M424s on for a gravel ride, along with my gravel wheelset.
Pedalling with just my left foot makes it go away. Pedalling with just my right foot is inconsistent but that's probably me.
I could almost believe it was from frame flex, but it's present even at low seated efforts. The mainly one-sided nature doesn't really fit with that either.
The crank isn't clipping anything as the pedals goes round, and pedalling while looking down, the chain is behaving normally.
It makes no difference whether the rear through-axle is normal tight or super-tight, and cleaning the axle seats doesn't help either.
It's not getting (much) worse - I must have done at least 1700km since I first noticed it (and got through a whole chain - the first time I tried to find it was a service in March and I've just had to replace the chain again).
At least the last point hopefully means it's not a sign of impending failure, but it's getting annoying, especially as I'm usually pretty good at catching this sort of thing - though of course not being able to replicate on the stand doesn't help. So what have I missed?