Remove hamster.
^ wrong mamal.
Sand/grit on the seals?
That be my first though, also could be those cheaper wheel with a massive rubber seal that created friction, lost count of customer complaining of that noise till I put a bit of grease between the hubs and rubber seal.
So, more than two? (sorry Ed, but it was a gift that needed opening)
@edscoble started
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^ wrong mamal.
Sand/grit on the seals?