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check pedal threads and chainring bolts and your saddle, seatpost and rear skewer
Add to this rear derailleur, chain, crankset.
Quick way to tell if it’s the BB is to put the bike on the stand and pedal forwards and backwards. If you’re ‘lucky’ you’ll be able to replicate it on the stand; it’s trickier to ID when the clicking only happens under a rider’s weight. Does the clicking happen in both directions? While moving each crank arm? What about without a chain? Any play in crank arms or excessive friction?
If it’s definitely the Bb, quick way to tell if it’s the bearings is to remove the crank arms and feel each bearing cartridge. Replace if not slippery smooth. If bearings are fine, reassemble cranks with care. If they don’t have any play, spin smoothly and still click, you’ll have to replace the bearings.
I realise that’s not exactly quick…
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I've already eliminated pedals, chainring bolts, shoes, saddle, seatpost, stem and skewer, etc. I'm not Dammit, this isn't my first rodeo.
I don't want to replace the BB. I've got a Park Tool BB30 bearing remover thing - I assume it works on the outside of the bearing so should leave the innards intact. I don't want to make it worse though. Maybe I could drizzle some shizzle on the outside of the bearing and note any change in noise.
Knocking the bearings out would probably knacker them, so you can knock new ones in and see if it fixes it, before that I'd remove, regrease and refit all the other stuff first to see if it's them and check pedal threads and chainring bolts and your saddle, seatpost and rear skewer. If it is the BB then the thread together replacements from wheelsmfg or similar are better.