66 Gto Convertible Biggest Tire Combo

[toofun]

OK,

I know there is a wheel fitment guide but have not been able to find any info on a 66 GTO. What is the biggest tire I can fit on the front and rear of a 66 GTO and what would be the back spacing

16 inch rim
15 inch rim

Thanks
Mark
TOOFUN

[68Formula]

Did you try asking on the PerformanceYears website? If no answer here there's probably a few people running the larger diameters.