Will,
I don't know if this will answer your question, but the G60x15 was the biggest factory tire available on the '71 GTO. Its size was approximately 26.5 inches tall, and had a tread width of about 9.25 inches.
As far as what can fit on a '71 Goat, I know that my brother ran around with L60x15s on the rear of his '70 GTO, without raising the rear with air shocks or air bags. It was tight, but they didn't rub anywhere!
Dan Jensen
|