Difficult route with beautiful uphills and downhills. It can be done in both directions. Combination possible with Ornon Loop. The ascent is timed to Col de La Morte from Séchilienne, Time Too device.
This is a very complete route, with uphills to passes, downhills, and plains. Often taken by the Tour de France or the Criterium du Dauphine, you'll enjoy this route!
You can take the alternative mythical "ramp of Laffrey) where Laurent Fignon broke the speed record for the Grand Boucle reaching 110 km/h.
You can time you while cycling from Séchilienne to La Morte pass through Time Too device.
Almost 1500 m difference in height for a 50km loop.