My 2 cents.......worked for Goodyear (retail & wholesale) from '71-'73. The Goodyear Polyglas was largely promoted for it's mileage enhancements. We began to sell some Polyglas as it made its entry but they were an expensive tire for those days as was Firestone's version.....they were both always hard to keep balanced and often "cupped". It was always a battle between the two with Goodyear having the edge. Didn't sell too many to muscle car owners as it was out of the budget for most and for that audience it was more about looks (RWL & size) not mileage. Once in awhile we would get some 60 series RWL Polyglas and we'd all asked what the heck do you put these on? Would get some blems once in awhile and they were less $$ and would usually go fast. Don't remember them ever being an OE tire.
Then the Michelin radial tire entered the war (via Sears primarily) and handling and comfort seized many higher end buyers. Polyglas and its brothers soon began the trend downward.
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Dick
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