They were built by CCW for 315 up front and 335 out back on a ZR-1.
Kumho makes the new XS in those sizes and they are nice affordable street tires with good grip that don't turn into surfboards in the rain. I just ran 700+ miles on them from vA to Bowling Green and would recommend them if you are planning to use these wheels on the street. BFG, Michelin, and Goodyear all make premium tires in those sizes too.
The only "rub" I ever had was on the brake duct lines I was running when AX'ing the Z and then only at full lock turns in the pits. So the fit on a zR-1 has no problems in stock form!!!
Tony
More pics. If you know Tony Watson, these were his.
