993 18's to 19's
 

Do stock 996 997 19" wheels fit on a 993 C4s?
noticed front and rear TIRE diameters are different on both. Anyone know how Porsche compensates for that difference on 4 wheel drive cars?

Do you mean width, because diameter is 19 front and rear, width is different but I think should have no effect because I think you need to keep the tire diameter the same no matter what the width is.

Hi there,

Keep in mind you have a wide body thus in need of lower off-sets that the 996/997 have to offer, to answer your question yes, they can both be used but with the proper spacing...

-Eli