PHillary,
FYI,
I have a 1986 944 NA and my wheel setup is the following if it helps:
Front: 18x8 ET50+7mm spacer with 225/40 ZR18 Michelin pilot sport 4s
Rear: 18x10 ET50+7mm spacer with 275/35 ZR18 Michelin pilot sport 4s
This setup works well for me. No rubbing, plenty of room all around, great performance and I have plenty of thread purchase. stock studs.
