ðə nˈæʃənəl ˌɔːɹɡɐnᵻzˈeɪʃən ˌoʊvɚsˈiːɪŋ mˈoʊɾɚsˌaɪkəl ɹˈeɪsɪŋ bˈænd ˈɔːl kˌɑːmpətˈɪʃənz ˌɔn bˈoːɹd tɹˈæks ʃˈɔːɹɾɚ ðɐn ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪntiːn.
The national organization overseeing motorcycle racing banned all competitions on board tracks shorter than  in 1919.