Originally Posted by
cmcanulty
Does it make sense if it is the pulleys that the noise would be there only on the smallest cog?
Yes, because on the smallest cog, the chain will be putting sideways thrust on the bearing. Just hit it with wd40/oil and see if it goes away.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1