Hi every one! I have a set of 18 wheels from 997, F 8.5 et52 and R 10 et 58. As I understand, the fronts will fit just fine no spacers needed , but what about the rear wheels, what size spacers do I need to clear on the inside and at the same time be in a harmony with the fronts. I'm thinking about 15 mm., what do think?

 

check this site.. http://www.1010tires.com/Tools/Wheel-Offset-Calculator

if you know the OEM offsets and your new offsets, you can figure out almost anything else from the site... except extra offset you're looking for for a "flush look", because the OEM combo is not flush.

I had to mount my new wheel/tire combos w/out a spacer (which I knew would fit w/out problems based on the site), and then measure the distance from the outer part of the tire to the edge of the fender.

It was between 15mm and 18mm, so I went w/ the 18mm.

Remember to get your car aligned when you put spacers on it, as the geometry changes.

 

Thanks for your replay.
The rims have no tires at the moment,and it is very hard to measure at this point, that is why I'm asking. Just want everything to be prepared when tires arrived.