NameSeasonsWorld ChampionshipsMotoGP Wins500cc Wins350cc WinsMoto2 Wins250cc WinsMoto3 Wins125cc Wins80cc Wins50cc Wins Carlo Ubbiali1949-19609250cc - 1956, 1959-1960125cc - 1951, 1955-1956, 1958-19600 0001302600 Tsutomu Udagawa1990-199300 00000000 Ed Uding?00 00000000 Noboru Ueda1991-200200 000001300 Hideaki Ueno199100 00000000 Katsuji Uezu1997, 1999-200000 00000000 Youichi Ui1995-2004, 2006-200700 000001100 Tohru Ukawa1994-200501 00040000 Robert Ulm?00 00000000 Stephan Ulrich?00 00000000 Franco Uncini1976-19851500cc - 19820 50020000 Brett Underwood200300 00000000 Hisashi Unemoto1988-199200 00000000 Franz Ungar?00 00000000 Patrick Unger2002-2005, 200700 00000000 Malcolm Uphill1968-197000 00000000 Dominic Usher?00 00000000 Joan Uviña?00 00000000