We've played this game before, and I'm reluctant to begin another round. 
 But after a fruitless deep dive into a general internet search trying to 
identify the source of my sound, I thought bringing up my issue here might 
be of help.  Here goes....

I am the proud owner of a beautiful, creamsicle colored Roadeo that I 
purchased from a fellow list member here a couple of years ago.  I 
purchased only the frameset, and built up it up myself.  A short while ago 
I began to notice a creaking, clicking, cracking-type sound when climbing 
steep-ish hills.  I loosened and re-tightened just about everything(except 
the bottom bracket) in an attempt to fix whatever the source of the sound 
might be.  No luck.  While out on a ride yesterday, I noticed that the 
sound was apparently getting worse.  I started to fear that there was maybe 
a crack somewhere in the frame, and made a plan to remove the crank and 
re-install the BB to eliminate it as a possible source(which I ended up not 
doing.)  But further into the ride, I happened to discover that the sound 
only occurs when I am in one of the 3 largest cogs on the cassette.  I made 
about 7 or 8 trips up and down one of the steeper hills on my route, and 
was able to confirm that it did not happen in the 4th, or 5th, or any other 
cog in back -- just the 3 largest.  

For clarification, I am running a Shimano 11sp Ultegra group.  The sound is 
NOT regular.  Meaning that it doesn't occur in the same place in either my 
wheel's or crank's rotation. It happens both when seated and while I am out 
of the saddle. It is more of a cracking, creaking, sound rather than a 
clicking sound(although it does sound clicky,) if that makes any sense.  It 
sounds like what I'd imagine a a cracked something-or-other to sound like.

I suppose I'll remove and reinstall the cassette when I get a chance, but 
figured I reach out to you all to see whether anyone has an inkling of what 
the trouble might be.  Please let me know your thoughts!

Thanks!

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