Teams und Fahrer 2004

46	Valentino Rossi	ITA	Yamaha	Gauloises Yamaha Team
7	Carlos Checa	SPA	Yamaha	Gauloises Yamaha Team
69	Nicky Hayden	USA	Honda	Repsol Honda Team
4	Alex Barros	BRA	Honda	Repsol Honda Team
3	Max Biaggi	ITA	Honda	Camel Pramac Honda Pons
6	Makoto Tamada	JAP	Honda	Camel Pramac Honda Pons
10	Kenny Roberts	USA	Suzuki	Suzuki Grand Prix Team
21	John Hopkins	USA	Suzuki	Suzuki Grand Prix Team
?	Norick Abe	JAP	Yamaha	Fortuna Yamaha Team
33	Marco Melandri	ITA	Yamaha	Fortuna Yamaha Team
15	Sete Gibernau	SPA	Honda	Telefonica MoviStar Honda
45	Colin Edwards	USA	Honda	Telefonica MoviStar Honda
12	Troy Bayliss	AUS	Ducati	Marlboro Ducati Team
65	Loris Capirossi	ITA	Ducati	Marlboro Ducati Team
9	Nobuatsu Aoki	JAP	Proton	Proton Team KR
80	Kurtis Roberts	USA	Proton	Proton Team KR
35	Chris Burns	GB	Harris-WCM	Harris-WCM-Team
56	Shinya Nakano	JAP	Kawasaki	Kawasaki Racing Team
66	Alex Hofmann	D	Kawasaki	Kawasaki Racing Team
67	Shane Byrne	GB	Aprilia	Aprilia RS3 Team
99	Jeremy McWilliams	GB	Aprilia	Aprilia RS3 Team
50	Neil Hodgson	GB	Ducati	D´Antin Ducati Team
11	Ruben Xaus	SPA	Ducati	D´Antin Ducati Team

Die MotoGP-Neulinge:

Shane Byrne (GB/Aprilia)
Alex Hofmann (D/Kawasaki)
Neil Hodgson (GB/Ducati)
Ruben Xaus (Spa/Ducati)
Kurtis Roberts (USA/Proton)

Erhielten 2004 keinen Vertrag mehr:

Tohru Ukawa (JAP/Honda)
Olivier Jacque (F/Yamaha)
Garry McCoy (AUS/Kawasaki)
Andrew Pitt (AUS/Kawasaki)
Noriyuki Haga (J/Aprilia)

Markenwechsel:

Valentino Rossi (I): von Honda zu Yamaha
Alex Barros (Bra): von Yamaha zu Honda
Colin Edwards (USA): von Aprilia zu Honda
Shane Byrne (GB): von Ducati zu Aprilia
Jeremy McWilliams (GB): von Proton zu Aprilia
Shynia Nakano (J): von Yamaha zu Kawasaki