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The 987 18" rears are 265/40/18 with a OD of about 26.3"; the 275/40 is 26.6".
The std. 987 18" front is 235/40/18 with a OD of 25.4"; the 245/40 runs about 25.6".
So by moving up a 245/275/40/18 combo, you keep the same rough proportions between the two tire sizes. This tire combo size is very popular with the Cayman crew.
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2013 Boxster S
2006 Boxster--sold
1999 Boxster--sold
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