I think there are differences in the size of the various reproduction tires, because some people have trouble fitting the spare in the tub and others don't.
My car is a 67, but it happens to have the early 63 tub (no notches in the lip), so perhaps it is the same tub you have. The reproduction Goodyear redlines that I got from Kelsey Tire fit with no problem. Also, the Pirelli P205/75R15 radials that were on the car when I bought it fit with no problem.
Since circumference is easier to measure accurately than diameter, I checked the circumference of both tires (you can divide by 3.14 to get diameter). The redlines are 87.5 inches, and the radials are 86.5 inches. A quick and inaccurate check of a 67 tub that I have in storage suggests that it could accomodate tires up to about 90 inches in circumference.
I never thought to ask about diameter/circumference when I ordered my reproduction tires, so I guess I got lucky. Since there are at least two suppliers of reproduction tires (Kelsey and Coker) and perhaps several brands allowable per the TIM&JG, it sounds as though the diameter of the tire needs to be yet another consideration in the selection process.
The judging guidelines allow the spare to differ from the four road tires, so maybe you can do some investigation and get a different reproduction tire for your spare.
My car is a 67, but it happens to have the early 63 tub (no notches in the lip), so perhaps it is the same tub you have. The reproduction Goodyear redlines that I got from Kelsey Tire fit with no problem. Also, the Pirelli P205/75R15 radials that were on the car when I bought it fit with no problem.
Since circumference is easier to measure accurately than diameter, I checked the circumference of both tires (you can divide by 3.14 to get diameter). The redlines are 87.5 inches, and the radials are 86.5 inches. A quick and inaccurate check of a 67 tub that I have in storage suggests that it could accomodate tires up to about 90 inches in circumference.
I never thought to ask about diameter/circumference when I ordered my reproduction tires, so I guess I got lucky. Since there are at least two suppliers of reproduction tires (Kelsey and Coker) and perhaps several brands allowable per the TIM&JG, it sounds as though the diameter of the tire needs to be yet another consideration in the selection process.
The judging guidelines allow the spare to differ from the four road tires, so maybe you can do some investigation and get a different reproduction tire for your spare.