THUNDER ON WHEELS is actually THUNDER IN CAROLINA (1960), a Howco International release starring Alan Hale, Jr. and Rory Calhoun, while BURNING RUBBER is a retitling of our friend William Grefe’s racing movie THE CHECKERED FLAG (1963), but the real "mystery movie" of this vehicular triple header is CYCLE GIRLS. The ad art is ripped from Ted V. Mikels' THE GIRL IN GOLD BOOTS (1968) -- not exactly a movie that screams "Cycle Girls" to us, but less accurate retitlings have been known to happen. More likely it's SHE-DEVILS ON WHEELS or something else involving chicks and bikes. The folks at Reel Distraction say it's a re-release of Peter Perry's THE YOUNG CYCLE GIRLS, an impossibility considering that movie was made circa 1976 and the ad in question is from '73. Any other ideas?