You don't want to make it too hard to get to the grease fitting on your hub. But to answer your question, if you don't buy center caps with your new rims, then yes your hub will show. You could paint it black to match the new rims, or order center caps to cover them. Just make sure they will fit over your current hub. Some center caps snap on from the outside, and some are made to slide in from the back. The second one will make it harder to get to your grease fitting.

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