[Porsche-O-Phile]

OK, lots of posts lately on wheel sizes - here's mine:

I currently have the stock 15" star / cookie-cutter rims with (I think) 7" wide tires on 'em. I'd sort of like to go with 16" rims and run a lower sidewall profile tire to keep the overall wheel + tire outside diameter the same. The manual says 16" rims are approved with 205mm (8") wide tires, but I'm wondering if I can go with 215s (8.5") or if I'm better off just staying with the book-recommended 205s for handling. Does anyone know what % sidewall-to-width I'd have to get with the 16s to preserve the proper outside diameter so my speedo isn't all jacked up afterwards? I suppose I could calculate it out, but it's easier to just ask someone that's done it.

Finally, I assume there won't be any ramifications braking-performance-wise going to 16s (since they're not THAT much different than the 15s on it now and they're approved in the manual) right? Which 16" rims were offered as an option by the factory in early 85? Were they the phone dials of fuschs? Do you recommend something else?

Thanks!