I'm embarking on a ride across the Pyrenees this year with my girlfriend. I have done the Ride Across Britain and ridden in the Pyrenees previously, but my girlfriend hasn't. In order to get her ready for this trip I wanted to ensure (empirically anyway) that she can do this, and so I want to find out what sort of wattage she needs to be able to maintain. The toughest day will encompass both the Col D'Aubisque and the Col de Tourmalet. I have no doubts about myself (but a nagging wariness about the effort). She weighs around 68kg, so what so or wattage will she need to maintain to get herself up these climbs? I'm hoping to replicate this using a turbo trainer as practise towards our trip.