20" rims on rear of 986 Boxster

[harryrcb]

That's because no one knows for sure, To most of us it doesn't make sense to put 20" on a Box, but if you are determined to do so, go ahead and do it. Make some careful measurements, you can get the outside dimensions from tire rack as to diameter and width of the tires on wheels and make sure you get the correct offsets. I daubt (again I don't know ) that you will be able to fit 10" wheels on the back. Good Luck