The second ascent is breathtakingly beautiful with a series of switchbacks known in France as ' laces ' .
The second ascent will peak at just under 900 - metres before the descent to the finish at Culoz .
The second ascent , which will peak at just under 900 - metres before the descent to the finish at Culoz , is breathtakingly beautiful with a series of switchbacks known in France as ' laces ' .