Rolling the fenders on a PV will gain you *very* little. Perhaps 1/4".

Most newer cars have a seam between the inner and outre fenders that turns into the wheel opening, and both layers are welded together. This can extend up to an inch, sometimes even more. Folding that over makes a lot more room. But the PV's fender is just a single layer of steel, it's curved over around the opening just enough to hide the raw edge.


I'm running 15X6 wheels on my car, with 205/50/15 tires. But they have a 3.375" backspacing. With a wheel that bolts on both front and rear, I think that's pretty close to as much as you can fit on without modifying bodywork. In the front, the rim can't be moved inward anymore because it would hit that upper/outer suspension pivot. And in the rear, you really can't have much more tire width to the outside because of fender clearance.
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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)