How big of wheel spacers can I use??

[Beemerdan]

I am thinking about getting some wheel spacers to put on my 1991 vert. Has anyone done this?
It has the stock suspension and wheels. Just wondering if anyone knows how big of spacers i can put on without having any wheel rub issues. I would like to know for both from and rear.

Also if anyone has pics of cars with this done that would be great too! I would love to see how it is gonna look.

Thanks!

[bmw325csi]

You can go 15-20mm without rubbing on 195's. Don't forget that you need longer bolts/studs though.