The Goodyear "Polyglas" are going to be repro tires that are bias ply. For looks only. ANY tire over 5-6 years old should be replaced even if it has No miles on it. Tires are made from a combination of many, many different ingredients and then Vulcanized, (baked like a cake) to cure or cook the mixture. Deterioration starts as soon as they leave the mold. Just like the way a cake would go bad after take it out of the frige. The original "T/A" radial has not been manufactured since Michelin bought BFG decades ago. They also bought Uniroyal tire co. The original T/a tire was made entirely of rayon. A 2 ply carcass and 4 folded Rayon belts, equaling 6 plies under the tread. The current T/A uses the original mold but uses the old steel belted Uniroyal "green tire" ( the tires name before it is baked in the mold). That is why the current T/A does not balance or handle/ride like they did back in the early seventies. I was there and sold hundreds of them, when I sold actual BF Goodrich, Uniroyal and Michelin tires when they were all separate tire companies.