250 Cc Classification
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points |
|---|---|---|---|---|---|---|
| 1 | Luca Cadalora | Honda | 30 | 45:07.590 | 1 | 20 |
| 2 | Wilco Zeelenberg | Honda | 30 | +6.074 | 4 | 17 |
| 3 | Loris Reggiani | Aprilia | 30 | +15.044 | 2 | 15 |
| 4 | Carlos Cardús | Honda | 30 | +19.352 | 5 | 13 |
| 5 | Masahiro Shimizu | Honda | 30 | +25.933 | 9 | 11 |
| 6 | Andreas Preining | Aprilia | 30 | +38.725 | 8 | 10 |
| 7 | Martin Wimmer | Suzuki | 30 | +50.153 | 3 | 9 |
| 8 | Helmut Bradl | Honda | 30 | +53.263 | 6 | 8 |
| 9 | Àlex Crivillé | Honda | 30 | +59.804 | 11 | 7 |
| 10 | Jochen Schmid | Honda | 30 | +1:03.512 | 12 | 6 |
| 11 | Jean-Pierre Jeandat | Honda | 30 | +1:18.138 | 5 | |
| 12 | Carlos Lavado | Yamaha | 30 | +1:25.047 | 10 | 4 |
| 13 | Doriano Romboni | Honda | 30 | +1:29.149 | 3 | |
| 14 | Harald Eckl | Aprilia | 30 | +1:29.756 | 14 | 2 |
| 15 | Stefan Prein | Honda | 30 | +1:37.767 | 1 | |
| 16 | Jim Filice | Yamaha | 30 | +1:39.633 | 15 | |
| 17 | Bernard Hänggeli | Aprilia | 30 | +1:40.754 | ||
| 18 | Urs Jucker | Yamaha | 30 | +1:46.428 | ||
| 19 | Leon van der Heyden | Honda | 30 | +1:50.358 | ||
| 20 | Jaime Mariano | Aprilia | 30 | +2:03.170 | ||
| 21 | Nick Ienatsch | Yamaha | 30 | +2:18.506 | ||
| 22 | Chris D'Aluisio | Yamaha | 30 | +2:22.648 | ||
| 23 | Rick Kirk | Yamaha | 30 | +2:32.444 | ||
| 24 | Corrado Catalano | Honda | 30 | +2:38.468 | ||
| 25 | Jon Cornwell | Yamaha | 30 | +2:50.132 | ||
| 26 | Mike Sullivan | Yamaha | 29 | +1 lap | ||
| 27 | Ian Newton | Yamaha | 28 | +2 laps | ||
| Ret | Pierfrancesco Chili | Aprilia | 24 | Retired | 7 | |
| Ret | Alberto Puig | Yamaha | 17 | Retired | ||
| Ret | Frédéric Protat | Aprilia | 16 | Retired | ||
| Ret | Kevin Mitchell | Yamaha | 15 | Retired | ||
| Ret | Allan Scott | Yamaha | 10 | Retired | ||
| Ret | Rick Tripodi | Yamaha | 7 | Retired | ||
| Ret | Paolo Casoli | Yamaha | 1 | Retired | 13 | |
Read more about this topic: 1991 United States Motorcycle Grand Prix