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People say 20" wheels are for show while 18" wheels are for go.
Mustang GT comes with 17" rims standard and 18" rims optional. The Shelby GT500 comes with 18" rims (9-1/2" wide). The Shelby GT500KR lists for $80K and still comes witth 18" rims, even though they could obviously afford larger wheels if they wanted them. One SVT engineer explained to the media (at the unveiling of the GT500KR) that 18" wheels were the ideal size for best performance with the Mustang platform. But perhaps the Camaro chassis can better utilize 20" rims? And the Challenger SRT8 comes with 20" wheels, but they are forged aluminum (lighter than cast aluminum) and have a 45 aspect sidewall (not a skinny 30 or 35 aspect ribbon of a sidewall).
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