bigger tires for "iron cross" rims?

[apcollins]

I'm currently running 160/80 R13 size tires on my 1979 Spider 2000 (stock rims) I believe people sometimes refer to them as the "iron cross" look. I was told by someone that I could fit 180/70 R13's on this rim, is this true?

for that matter, what is the range of tire sizes that can be fit to this rim? I feel like this is information that would be helpful to many people...

[Tappy]

i found this a handy tool to compare old setup and new tyres , if everyone post his size of tires you can figure out how big you can go


my size tires are : 195/50 R15....

http://www.miata.net/garage/tirecalc.html