How big for my Hoosier R6's

[jwg2]

I'm buying a new set of Hoosier R6's for the rear of my 2001 Z06. I'm using stock rims. My last set was slightly upsized, 305/30-18 , wondering if I can go any wider. Any recommendations?

[vader03]

I run a 315/30R18 Hoosier A6 on my stock 2003 Z06 wheels without any problems, I do not believe you can put a 345 on the rear 18x10.5" wheel. Maybe a 325 but I haven't seen any 325s

[Luke@tirerack]

most go with

275/40-17 front
305/30-18 rear

this size combo yields great results