This loop, starting from Bernin, allows a warm up along the nationale, then a 700m climb up to St. Bernard du Touvet (9%).  Before attacking the Col du Coq (HC), one has a 20 minute ride along the plateau.  The Col du Coq is another 500m (9%) climb.  The descent passes through a dark and often wet tunnel--I always change my sunglass lens to clear.  I also stop halfway to let my brakes cool!

Four cols and most of the route up and out of the valley.  A variant is to follow the plateau des Petites Roches instead of the St. Nazaire - La Terrasse, eliminating any valley travel.  I've always done this loop counter-clockwise ending with the Col du Coq from the north: a very tough finish.

Vue magnifique de Grenoble ainsi que des Vallées et Montagnes, mais pour en profiter il faut monter les deux kilometres à 17% de moyenne. Si la vue ne vous motive pas, il y a une fontaine d'eau potable ainsi qu'un restaurent en haut...