Factory wheel markings

[oc-boxster]

I've read before the factory wheels have dimensions stamped on them near the valve stems? The 18" turbo twist wheels on my 02 S do not have any width outback spacing info stamped on them. The window sticker has them listed as an option. Is there any way to tell if I actually have Porsche wheels or aftermarket copies? Where is this info stamped into factory wheels?

[Chuck W.]

I have seen OEM wheels that did not have the off sets stamped by the valve stems. To ensure you have OEM wheel take a wheel off and you should see a part number on it as in the below photos. First one is a hollow spoke and the second a solid spoke.

[oc-boxster]

Great thanks for the info.

[coreseller]

What Chuck said. Here is a pic of an OEM Porsche wheel with the O.D. and Offest:



Some OE wheels have them, some don't.