Factory Ducati riders Andrea Dovizioso and Nicky Hayden will not switch to the 'lab' version of the Desmosedici GP13 at this weekend's Assen round.

Both riders evaluated the latest version of the lab bike, which has been raced by factory development rider Michele Pirro in several events, during the post-race Catalunya test.

Dovizioso declared that the two bikes were "very similar", while team-mate Nicky Hayden was even less likely to change after being "consistently faster" on the standard version.

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"We'll use the same bike that we had at Barcelona, so without the updated frame," said Dovizioso of Assen. "I must admit that I haven't had much luck at Assen and that I've only had a pair of third-place finishes in the last two years, so we hope to go better this time!"

Hayden won the 2006 Dutch TT, after a dramatic final turn showdown with fellow American Colin Edwards, then finished on the podium again in the 2007 event.

"The next three rounds are all at tracks that I like a lot, and Assen in particular is a great circuit with a great history," said Hayden. "I really enjoy it, and I feel focused and ready. Hopefully we can use the information from the test in Barcelona to have a good race."

Hayden and former Ducati team-mate Valentino Rossi finished sixth and 13th respectively last season, after tyre wear issues.

"We'll have to work a lot on the setup to avoid the problems that we had last year, so it'll be important to have a good balance and manage good tyre life," confirmed team manager Vittoriano Guareschi. "Both of our riders have had some good results in the past at Assen: Nicky likes the track a lot, and although Andrea isn't quite so fond of it, there are reasons to think we should have a good race."

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