I'm a bit skeptical about these results. The whole first half of the video is about how they questioned and were apprehensive about using 19" tires. Then the track portion is unblinded so the driver knows what he's running. He was destined to not like the 19"s even before he began.
I'd be more interested to see him just get in the car, run his best lap, and then find out what size he was driving on (or try to guess).
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2013 Cadillac V-Wagon, RIP Z
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