Hi folks,

Couple of quick questions for those wheel experts out there. I have the opportunity to buy a set of 18" Cayman S standard wheels (take-offs) for a decent price to use as track wheels. I did a whole bunch of searching, but am coming up dry. Here are my questions:

1. Is there any way to tell if the wheels really are take offs (OEMs and not knock-offs)? I have high res photos of all 4 (inside and out) and I compared them to some of the photos posted in the wheel wax article, but is there any way to be sure?

2. Is there any way to visually inspect the wheel to confirm if it has TPMS or not? Is the stem different on wheels without it?

3. The wheels come with PS2's installed. I want to ensure they are not patched/plugged so that I can use them on the track. I plan to take them to my local shop, which also happens to be an installed for Tire Rack, to have them taken apart, inspected, remounted and balanced before I track them. Will this be sufficient to ensure the wheels are true?

4. Can I switch between 19" Carrera S wheels and 18" Cayman S wheels with the same length wheel lugs or are they different and would they require spacers?

Thanks in advance for help with any of the above!

pf