Not sure what you mean by rear-hub vs. rear-wheel....
Hub is centre section that axle goes through. Contains bearings.
Wheel.... is typically hub + rim. On these Ninjas, hub + rim is one-piece combo.
So 250R hub is part of 250R wheel and cannot be separated.
And a 300 hub is part of 300 wheel and cannot be separated.
It's not possible to use 250R hub with 300 rim, or vice-versa, unless you cut off rim and weld it onto spokes of other wheel.
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