What they meant by 'big tires' were racing tires used in competition.
In the famous Car and Driver Z/28 v. Mustang test, T/A competitor Sam Posey was chosen to drive both cars. The Z/28 had power steering; the Mustang did not. He greatly preferred power steering; Penske tried it for a few races but removed it due to durability issues.
The test was in the July 1968 issue. Interesting, the Mustang arrived with F60 x 15 Goodyear tires on 7" wheels.
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