Former MotoGP champion Nicky Hayden admits he underestimated the scale of the challenge during his one-off return in last weekend's Aragon race, when he stood in for an injured Jack Miller. Riding Miller's Marc VDS Honda machine, Hayden - who quit the series to move to World Superbikes last year - claimed a single point with a 15th place finish at Motorland after languishing towards the bottom of the timesheets most of the weekend. Having never tried the new generation of Michelin MotoGP tyres introduced for this season, the American admitted getting up to speed with the French rubber was the most challenging aspect of the weekend. "The race I would say was the best session I had all...
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