Valentino Rossi believes tyre and electronic changes will make 2016 like 'year zero' for MotoGP.

The nine time world champion recently signed an extension to his Movistar Yamaha contract, keeping him in MotoGP for at least the next two seasons.

At the Sachsenring on Thursday, Rossi revealed that the 2016 changes - Bridgestone to Michelin tyres and the introduction of a standard ECU system - were a major factor in his decision.

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"I wanted very much to make two more years because I want to try the 2016 bikes," said Rossi. "I think that MotoGP will change very much after next year because two of the crucial things, electronics and tyres, will be different.

"So maybe it will be another type of riding style, another way to control the bike. It can change very much. It is like the year zero."

Rossi is joint second in the world championship with Dani Pedrosa heading into this weekend's German MotoGP. Pedrosa's Honda team-mate and reigning world champion Marc Marquez has won all eight races so far this year.

Crash.net took a look back at the extensive range of bike-tyre combinations Rossi has raced with in MotoGP earlier this week...