heat gun on low (a hair dryer might work too) will help you remove most of it. Once you have the sticker off, you will probably have some sticky stuff left. Go to your local auto paint store and pick up a small squirt bottle of adhesive remover (this stuff is a little expensive, but very handy to have around). That will do the trick. If there is any wax on the wheel, this stuff will remove it too.
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