From Bourg d'Oisans - south - [Average gradient: 4.8% - Maximum gradient : 11.2% - Distance 27.5km - Height gain 1293m]
At 2067 metres above sea level this sits 143 metres higher than its nearby cousin the Col du Glandon. The great thing about this Col is that it is only a distance of 2.5km from the Col du Glandon and so is an optional extra for the day - and at only 5km to the top and back to the Col du Glandon a worthy detour.
The Col opened in 1912 and was first used in the Tour de France in 1947. Since then it has featured a further 15 times.