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Yamaha Factory Racing finally held its official 2012 team introduction the day before the three-day official IRTA MotoGP test at Jerez, Spain is scheduled to begin. The official livery features Yamaha’s traditional blue/white color scheme, with major sponsorship by Japanese petroleum giant Nippon Oil under its ENEOS brand (curiously competing somewhat with Yamaha’s in-house Yamalube oil brand on the upper fairing). But as has been the case ever since Fiat jumped ship when Rossi left to Ducati, there is no title sponsor for the Yamaha MotoGP squad, a reflection of MotoGP’s troubles in securing sponsorship in the wake of the worldwide economic crisis.

Here then are some official photos from Yamaha Racing that we’ve provided in wallpaper sizes for your desktop viewing pleasure, plus video interviews with Ben Spies and Jorge Lorenzo, and an introduction to the 2012 Yamaha YZR-M1.

In a sign of the increasing influence of social media, Ducati unveiled the new GP12 MotoGP bikes of Valentino Rossi and Nicky Hayden on the internet via team sponsor TIM's official facebook page earlier today. In a nearly hour-long presentation, the new livery for 2012 was presented, along with Rossi and Hayden answering a few questions about the bike and their upcoming 2012 season. The bikes are usually presented during the annual Wrooom team introduction in January, but they were not even built yet, much less have the livery decided upon.

For you Ducati/Valentino Rossi/Nicky Hayden fans, here's a selection of wallpaper-size images of both bikes from the presentation. Enjoy!

More sportbike wallpapers.

More sportbike wallpapers.

BMW introduced its two World Superbike race teams in Phillip Island, Australia, and the teams are taking part in a three-day test this week prior to the opening event of the season this weekend. Leon Haslam and Marco Melandri will ride for the factory team, while Andrea Dosoli was recently names as the new Head of Race Operations. The rest of the management structure around BMW Motorrad Motorsport Director Bernhard Gobmeier remains unchanged: Stephan Fischer is Head of Development, while Josef Hofmann, the Managing Director of alpha Racing, assumes responsibility for the Stephanskirchen factory.

More sportbike wallpapers.

More sportbike wallpapers.

Aprilia unveiled its 2012 World Superbike team in Milan, Italy, with 2010 champion Max Biaggi and new teammate Eugene Laverty presenting the team's RSV4 machinery. "I must say that for 2012 I am even more motivated after what happened last year," said Biaggi in a press release issued by the team. "I look at this bike which I have looked after from the time it was introduced as very much my own and I'm certain that we have a lot to say and a lot to win, I'm certain that the level of competition, with the many team changes among my rivals, has increased even more."

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.

More sportbike wallpapers.