fwiw, i had an annoying "creaking" noise coming from what i swore was my BB, on every pedal stroke out of the saddle. after a year of unpacking, cleaning, lubing, tightening, replacing, etc etc, the thing was still there. i drove me nuts. finally, i happend to replace my wheel set and the noise went away. what it turned out to be was my rear hub. trying your buddy's wheels is worth a shot.