I can appreciate your point about filling out the wheel well, but if the bug
has the correct diameter wheel and tire combination, the outside dimensions
of the tires are the same for 15" and 16". I wouldn't go to a 15 either-
but it could be done with a taller tire, and many people do this in the
winter for snow tires - like a 195/65-15 instead of the stock 205/55-16. I
seem to remember some issue about the smaller wheels not fitting onto some
beetles - possibly due to brake size?
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