Didn't really sound like this but worth a check. I think the way the wheel is laced this might be unlikely.
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.
@miro_o started
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Didn't really sound like this but worth a check. I think the way the wheel is laced this might be unlikely.