Crash Bardet, Vuelta 2017, stage 16, individual timetrial

http://www.wielerflits.nl/nieuws/298734/vuelta-2017-samenvatting-tijdrit-naar-logrono.html somewhere in the beginning

The fall of Bardet seems to be caused by a classic mistake: starting to paddle again too early in the bend. The back pressure of the outer leg that was down, falls away with it. There may even be some extra pressure to the outside. Therefore the rear wheel slips sideways.