Wiggins claims to have held 450w for just over an hour in the final TT of the 2012 Tour de France in his book. Putting aside just how dubious that performance is in the final week of a grand tour, it gives a good indication of his capacity-from the horse's mouth as it were.
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Professional Athlete: http://jordancheyne.wordpress.com/ http://www.strava.com/athletes/145340
Coaching Services:http://www.peakformcoaching.com/