Depends on the type of rivet but most can be removed by drilling off the head with a larger size drill bit then pushing the rivet the rest of the way out.
You will then need a rivet gun and appropiate size rivet to replace it.
are you talking about the front or back?
the back bearings are a non serviceable part, the in order to change the bearings u need to change the hub,
the front bearings can be separated, but chances...
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