The Alpe d’Huez Triathlon L is the crowning glory of the week for one simple reason : its extraordinary cycling route. The 118km boasts 3200m of positive ascent, and starts by a fast pedal down the Oisans valley to join the foot of Alpe du Grand Serre, which is also the first col of the day (15km at 6.5%). This is followed by a long segment in the rolling hills of the Valbonnais valley and an ascension of the Col du Malissol (2.4km at 8.5%), where the scenery is sublime. During this section there is a possibility of picking up a personal food supply at the 60km point. The Col d’Ornon, which steepens as it goes, is the third big undertaking of the bike circuit, before riders dive into the dizzyingly fast descent to Bourg d’Oisans. Here the legend begins, with the conquest of famous 21 bends of Alpe d’Huez (13.9km at 8%). For most athletes, the main issue of the ride is being able to reach the foot of the Alpe d’Huez climb with enough strength to climb properly, and to be able to transition smoothly to the running race. Patience is needed here, especially during the first 3 bends which are by far the most arduous.