Mezue ahịrịokwu na-esonụ: N'afọ 1955, e nwere agbụrụ iri na otu n'asọmpi AAA Championship Car, nke malitere na Speedway, Indiana na May 30 ma gwụzie na Phoenix, Arizona na November 6. Enwekwara otu asọmpi na-abụghị asọmpi na Mechanicsburg, Pennsylvania. Onye mmeri mba AAA na onye mmeri Indianapolis 500 bụ Bob Sweikert. E gburu Manny Ayulo n'Indianapolis mgbe ọ na-eme ọzụzụ maka ndị
1955 Indianapolis 500, na Bill Vukovich, onye meriri ugboro abụọ, nwụrụ n'ọsọ ahụ n'onwe ya. Jack McGrath, onye mmeri ugboro abụọ (1952, 1953), nwụrụ n'ọsọ ikpeazụ na Phoenix na agba nke 85. Nke a bụ afọ ikpeazụ nke AAA National Championship; USAC kwadoro usoro ahụ na-amalite n'afọ na-esote.