The Firestone 721 were some of the least expensive tires to drive.
Lifetime warranty, and would have tread separation at 10~15 k miles.
Take the car back, get a new tire free to include mounting and balancing.
Got about 150k miles on that car, and never bought a tire after buying the 721's.
Also had a set of Firestone Wide Ovals about 1968. Lasted less than 6k before they were worn out (all four, not just the rears).
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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