I've been running 215/35r18 tires for about 2 years and have driven over some serious bumps that I thought would have bent my rims and it never did. I think that has more to do with the quality of wheels not the tires necessarily. I am riding on the Eibach Pro Kit and have not had any troubles with rubbing. Oh yeah the rims that I am running ar 7.5" wide and have an offset of 45mm. Hope this info helps.
05 ZX5 Blacked-Out on 18s