On Friday at the Czech Republic MotoGP, Yamaha YZR-M1 Project Leader Kouji Tsuya revealed that Valentino Rossi and Maverick Vinales did re-test the 2016 chassis earlier in the season.

Both factory stars had struggled badly in hot, low-grip conditions at Jerez and Barcelona, while Tech 3 rookies Johann Zarco and Jonas Folger remained competitive on last year's bikes.

Although the option of changing back to the 2016 frame was frequently played down at the time, Tsuya stated the Movistar team-mates were indeed given the old chassis - alongside two new designs - during post-race testing in Barcelona.

"At Barcelona, we stayed for two days of testing," Tsuya said. "And there we compared, with both riders, four chassis: One was this year's chassis, one was last year's chassis that Tech 3 are using, and we also prepared two types of new chassis.

"Finally, both riders chose the same chassis, which was one of the new ones. And now both riders are using this same chassis."

Vinales (three wins) and Rossi (one win) start the second half of the season second and fourth respectively in the ultra-close championship standings. Zarco and Folger are sixth and seventh in the standings, as the top satellite riders, with one podium each.


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