Dan,

That surprises me, I guess. I be afraid that in hard driving, the narrow wheel would tend to let the 315s flex the sirewall (what little there is) too much. I have 11' wheels on the back of the turbo, and the 295's look about right on it.

You're right, Porsche like their cars to understeer, so you'd need a lot more rubber on the front if you went that wide in the back.

brad

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PCA DE Instructor