It looks like Chip Foose will be using 15" wheels/tires on his Pantera. If you look at the attached photo, the tires in question are Pirelli P7 Corsa Classics. I assume he'd use 235/45-VR15 in the front but the tires in the photo, which must be the rears, are 305/35-VR15. Seems a bit short to me.
Pirelli makes the P7 Corsa Classic in a 315/40-VR16, which would work for people who wanted to run their OEM wheels on the front and 16" Campi replicas at the rear.
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