For first generation Camaros, only Z/28 came with 15" rally rims, in others there were an option.
Year / Rim Size / Tire Size
1967 / 15x6 / 7.35x15
1968 / 15x6 / E70x15
1969 / 15x7 / E70x15
15x6 (7) = 15" in diameter by 6" (or 7") wide rims.
The letter in the tire size corresponds to the metric measurements of the width, with A=155mm through L=235mm ("I" is skipped). The number is the sidewall height to tread width ratio (just as it is now).
For Camaros, the following conversion should work properly: E70x15 = P205/70R15, E60x15 = P225/60R15, F60-15 = P235/60R15, and G60x15 = P245/60R15.
If you want to find which tire came with your car see the tire sticker or visit the CRG site (www.camaros.org
Hope this helps, Mauricio (Chile)
[This message has been edited by Moris (edited 07-27-99).]