Re: Disc or wheel?
Upright wheels are much better than disc/flying saucer style wheels. Those types of wheels do not allow a natural running position in a way that forces hamsters to run with their sides arched. You also can't properly size them like upright wheels - the actual running surface is significantly less than the same size upright wheel, likely only 25% of whatever size is actually stated as the size of this wheel type(and even that doesn't guarantee freedom from side arching)!
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