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I run 315's on stock Zo6 rear wheels on a lowered car without fit or rubbing problems of any kind. They do not require a spacer. The tires are Kumho V710 race tires. If you are considering a 315, go to the manufacturers web site and get the exact size specs and compare them with the Kumho, if close, they should fit fine. Regardless of what anyone says, there are often substantial differences in actual sizes between different tire manufacturers. A 315 sized Bridgestone can have as much as 1/2" difference in dimension when compared to a Goodyear or Firestone.
I run 315's on stock Zo6 rear wheels on a lowered car without fit or rubbing problems of any kind. They do not require a spacer. The tires are Kumho V710 race tires. If you are considering a 315, go to the manufacturers web site and get the exact size specs and compare them with the Kumho, if close, they should fit fine. Regardless of what anyone says, there are often substantial differences in actual sizes between different tire manufacturers. A 315 sized Bridgestone can have as much as 1/2" difference in dimension when compared to a Goodyear or Firestone.