My 2002 Boxster S currently has the original 17" wheels. I am considering getting a set of 18". However I am very confused after visiting TireRack and Porsche dealer part pages. I saw a range of wheel widths of front and rear, and a range of offsets. My question is, if I don't want to add spacers or anything extra to my car, what wheel specs are good?

Front: 18/8-9? Offset 50 or 5x???
Rear: 18/9-10? Offset 44 or 5y???

Also, tire size recommendation would be 235/40/R18 and 265/35/R18??? Or there are other sizes to go?

 

Factory 986 wheel/tire specs

18x7.5 ET 50, 225/40/18
18x9 ET 52, 265/35/18

I wouldn't go off on the tire size but wheels depending on width & offset it may or may not fit depending on those 2 factors. If it's 5mm off while retaining the same wheel width I think you'll be safe.

Here's some useful reading:
http://mike.focke.googlepages.com/wi...syouwantfit%3F

 

Thanks ekam!

I've also found the part catalog and learned the factory specs at:
[media]http://login.dealerskins.com/SiteSpecific/BoardwalkPorsche/pdf/Catalog/CD_Contents/data/Catalogues_USA_CDN/986_USA_KATALOG.PDF[/media]