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Here's another view of the setup Jim has. I eventually flipped the wheel over, too, to use the space for tools and spares, but this is how VS used to do the installation.
Like everyone has said, it's a 135/15 on a 4.5" rim. It just fits (the frunk lid contacts the tire a little).
VS may have mounted the tire back a little to allow access to the battery terminals underneath, but any farther forward, and I don't think you could close the lid.
The carpet at the front lies directly on top of the battery (a cardboard or masonite panel in between is probably a good idea.)
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