Nyorai kupfuurira kweiyi ndima - Nokuda kwa 1951, Mutual yakakwira zvikuru mitengo yayo yokushambadzira, uye mutsigiri wayo mukuru, Perfect Circle Piston Rings, akabvisa tsigiro yayo. Mutual pakupedzisira yakasarudza kurega kufukidza chiitiko chacho, uye kwakaratidzika kwenguva yakati kuti mujaho wa1951 hauzopfuudzwi paredhiyo. Pakuvamba kwaMay wa1951
Mutungamiri weSpeedway, Wilbur Shaw, akaita chibvumirano chomuminiti wokupedzisira chokuti WIBC ifukidze nhangemutange yacho, naSid Collins semutauri mukuru. Chimiro cheWIBC chakatevera icho cheMutual's, nehupenyu hwehupenyu pakutanga, kupedzisa, uye zvinyorwa zvenguva dzose munhangemutange yose. WIBC yakapa kufukidzwa kwayo kune anenge makumi maviri nemashanu mamwe maMutual akabatana.