These caps are simply pressed on. The way I remove them is to take a very large set of Channellock pliers (with at least 12 inch handles) and grab the cap top and bottom with the tool. Then rock the cap up and down until it comes loose. You don’t need to squeeze hard enough to mar the cap, just hold it and wiggle it up and down, it will slowly work its way off.
By the way, this is what is properly called a “hub cap”. The large disks that cover the whole wheel are properly called “wheel covers”, not “hub caps”. You can win a bet with that fact next time you’re in a bar!
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