What is the tire size of a 1993 Ford Thunderbird?
1993 Ford Thunderbird tires are generally 15 inches.
I have 255/65-16 on my 2008, works great, and looks better than stock Regardles of looks, keep the original tire size. Reason being, if there is some kind of failure which happens to be tire related (Ex: older Ford Explorer with rollovers) you will have no recourse from the tire manufacturer (even if it was a tire defect because you didn't install the recommended tire.) dealer or Ford.