I'm going to gamble not much larger, although expanding 1 inch only brings you a .5 inch closer to rubbing.
Looking at the 12"s it looks like maybe an inch and a half between the bottom lip(at the bottom corner of the door) so you could go up at least 2 inches to 14 for sure no problems probably even 15, but then I would get a little worried about rubbing after going over large potholes(or bridge junctions). Also the bigger your tires are the more expensive by a good bit. I upped one size on my del sol for the same price tire and slightly better gear ratios(13-14, although they will easily fit 17s the tires are massively expensive(120+ each and they don't last very long at all.))
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