Aaaaaarghhh!!!!

I had this problem, it turned out to be a split chainring bolt. Swapped it out and it was fine. That was after buying a new bb...

Had the same problem and it was the magnet on my rear wheel hitting the cadence/speed sensor as it passed. The tolerance was very tight when I was seated (so looked OK when I was stopped, trying to diagnose the source!) but a wee bit of flex on the frame caused it to clip when standing up and hammering it. Was positive it was the cranks/BB...

It was the pedals when I had a similar problem, what helped was cleaning the threads on the pedals with a little GT85 effectively taking a little grease off if anything then the thread sat more snugly in the crank and no clicking which I think must have been over greased and working loose. Check the QR's as well, it doesn't sound like them but it never does

Just had my 9 month old Giant Defy 1 frame replaced under warranty because of the same noise.

Went through all the cleaning greasing stuff and then took it back to the LBS and they diagnosed a dodgy frame.

All been there! Always worth checking chainring bolts. I've even had ticking from an external bottom bracket cable guide – but you don't have one on your bike.

I'm going to make my fortune by inventing an audio device that you stick at different points on your bike to tell you where the noise is loudest, in order to identify where the creak is coming from.

Actually, I'll probably never get around to it so can someone else do it for me?

I've also found QRs to be the culprit on this, especially the rear one!

Clean and grease, it may do the trick.

Are chainrings all tight?

I had the same problem with the exception that mine only occurred when out of the saddle. Tried the same fixes but eventually tracked it down to a dry headset bearing seat.
I would have bet a large chunk of cash that it was drivetrain related though..

How does it feel through your feet when you put the hammer down? I had the same problem for aaaages and tried everything, eventually when sprinting I found that the strokes felt "sandy" almost.

Turned out it was the bearings actually inside the BB, just popped a new one on and problem was solved. Only thing that creaks for me now is the saddle and that's only when I'm on the turbo! (random)

Sounds silly too but how old are your cleats? You sure you're not just wearing down and causing a spot of friction on your pedals?

Try looking at your QRs too. Take the wheels out, give the contact points/dropouts a wipe, and if possible try some different skewers. I've been caught out by this a couple of times, and in both cases I would have sworn it was the BB.

What's your frame made from?

Does the noise change when pedaling hard vs spinning?

I had a ti Litespeed with a mystery tick when pedaling under very similar conditions to yours, I even went so far as to replace the bb and the chainset and that but that still didn't solve it.

Turned out to be a metal fatigue crack propgating around the bb shell / down tube interface.

Unfortunatley even after repair the frame let go with a pretty spectacular failure all the way round the down tube / bb shell.

I run SPD SL pedals and have a slight click on each rotation, as the pedal gets past 45 degrees - something loose inside the pedal body which is no big deal. Hopefully it's this not the bottom bracket..

My summer bike's got that problem too. No idea what it is... getting a new frame next year so I wonder if it'll recurr?

Does it occur only when seated ... saddle moving perhaps ?

More than likely to be coming from the interface between cleat and pedal. Various threads on how to fix.