| Grand Prix: | Vitesse du Mans |
| Flag: | France |
| Official Name: | Grand Prix Vitesse Du Mans |
| Location: | Bugatti Circuit |
| Course Mi: | 2.750 |
| Course Km: | 4.425 |
| Race No: | 14 |
| Season No: | 15 |
| Date: | 8 September |
| Year: | 1991 |
| Pole Rider 500: | John Kocinski |
| Pole Rider 500 Country: | USA |
| Pole Time 500: | 1:39.964 |
| Fast Rider 500: | Mick Doohan |
| Fast Rider 500 Country: | Australia |
| Fast Time 500: | 1:41.200 |
| First Rider 500: | Kevin Schwantz |
| First Rider 500 Country: | USA |
| Second Rider 500: | Mick Doohan |
| Second Rider 500 Country: | Australia |
| Third Rider 500: | Wayne Rainey |
| Third Rider 500 Country: | USA |
| Pole Rider 250: | Luca Cadalora |
| Pole Rider 250 Country: | Italy |
| Pole Time 250: | 1:44.963 |
| Fast Rider 250: | Helmut Bradl |
| Fast Rider 250 Country: | Germany |
| Fast Time 250: | 1:45.375 |
| First Rider 250: | Helmut Bradl |
| First Rider 250 Country: | Germany |
| Second Rider 250: | Carlos Cardús |
| Second Rider 250 Country: | Spain |
| Third Rider 250: | Luca Cadalora |
| Third Rider 250 Country: | Italy |
The 1991 Vitesse du Mans motorcycle Grand Prix was the penultimate round of the 1991 Grand Prix motorcycle racing season. It took place on the weekend of 6–8 September 1991 at the Bugatti Circuit located in Le Mans. France.
Originally meant to be held in Brazil, that race was cancelled for safety reasons, so the FIM decided to add a second French round. It is the only time in FIM Grand Prix motorcycle racing history two rounds were held in France during a season. The race's name was used for this race only, after the European Grand Prix moniker had been used for a race in Jarama that replaced the Yugoslavian race.
John Kocinski on pole. Kevin Schwantz gets the start from Kocinski, Mick Doohan, Wayne Gardner and Wayne Rainey.
Schwantz and Doohan battle for 1st, but at ten laps to go, Rainey just needs to stay in 3rd place to win the championship.
Rainey speculates that Kocinski let him take 3rd so he could win the championship, though he told team manager Kenny Roberts he didn't want Kocinski's help.
Kenny Roberts: "There were a lot of races where we shouldn't have won, and we really wouldn't have won if it wasn't for Wayne. There's a lot of races where had we had anyone else, it wouldn't have happened. Wayne was very, very determined to win it this year. Some years you can say the bikes were definitely better or our engineering was better, but this year Wayne was definitely better."[1]
| Pos. | Rider | Team | Manufacturer | Time/Retired | Points | |||
|---|---|---|---|---|---|---|---|---|
| 1 |  Kevin Schwantz | Lucky Strike Suzuki | Suzuki | 47:37.764 | 20 | |||
| 2 |  Mick Doohan | Rothmans Honda Team | Honda | +0.148 | 17 | |||
| 3 | Wayne Rainey | Marlboro Team Roberts | Yamaha | +3.468 | 15 | |||
| 4 | John Kocinski | Marlboro Team Roberts | Yamaha | +3.700 | 13 | |||
| 5 | Wayne Gardner | Rothmans Honda Team | Honda | +3.966 | 11 | |||
| 6 |  Juan Garriga | Ducados Yamaha | Yamaha | +37.852 | 10 | |||
| 7 | Doug Chandler | Roberts B Team | Yamaha | +38.342 | 9 | |||
| 8 |  Didier de Radiguès | Lucky Strike Suzuki | Suzuki | +39.290 | 8 | |||
| 9 | Sito Pons | Campsa Honda Team | Honda | +1:30.554 | 7 | |||
| 10 |  Adrien Morillas | Sonauto Yamaha Mobil 1 | Yamaha | +1:45.040 | 6 | |||
| 11 |  Eddie Laycock | Millar Racing | Yamaha | +1 Lap | 5 | |||
| 12 |  Niall Mackenzie | Roberts B Team | Yamaha | +1 Lap | 4 | |||
| 13 |  Marco Papa | Team Marco Papa | Honda | +2 Laps | 3 | |||
| 14 |  Andreas Leuthe | Librenti Corse | Suzuki | +2 Laps | 2 | |||
| 15 | Damon Buckmaster | Padgett's Racing Team | Suzuki | +5 Laps | 1 | |||
| Ret |  Cees Doorakkers | HEK-Baumachines | Honda | Retirement | ||||
| Ret | Jean Philippe Ruggia | Sonauto Yamaha Mobil 1 | Yamaha | Retirement | ||||
| Ret |  Michael Rudroff | Rallye Sport | Honda | Retirement | ||||
| Ret | Hans Becker | Team Romero Racing | Yamaha | Retirement | ||||
| DNS | Eddie Lawson | Cagiva Corse | Cagiva | Did not start | ||||
| DNQ | Nicholas Schmassman | Schmassman Technotron | Honda | Did not qualify | ||||
| DNQ | Helmut Schutz | Rallye Sport | Honda | Did not qualify | ||||
| DNQ | Martin Trösch | MT Racing | Honda | Did not qualify | ||||
| DNQ |  Josef Doppler | Doppler Racing | Yamaha | Did not qualify | ||||
| Sources: [2] [3] | ||||||||