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Originally Posted by TriGem2k
On a 18x8.5 I would go with a 225/40/18
On the 18x10 I would go with 285/30/18
These are both OEM Porsche Tire sizes.
On your set of wheels though your rears WILL require spacers. The ideal offset for an 18x10 wheel on the rear of the Boxster is 42mm-45mm. There is no way a 18x10 58mm will fit.
Hope this helps.
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what offset were your rear wheels (as described in your avatar) ?