well from what i know.....
my boxster has 10.5 inch width rims on the rear, and they pretty much touched the inside of the struts. pretty much because when the car raised off the ground, the rims touched. when the car was sitting on the ground, the rims could only fit a peice of cardboard through the strut to wheel. i had to put a 7mm spacer. 11inch on the rear will for sure need a spacer.
i would only try this on a new 987, dont even think about putting a 11 on the rear of a 986. my porsche mechanic already thinks im crazy for putting a 10.5 x 19 on a 986.
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