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@Manc_Ronnie
I've been out that way, and I suspect the route will take you from Bourg D'Oisans via the road with several unlit tunnels to Villard Notre-Dame, then from there up a track (perfectly doable on a road bike), then on to Villard Reymond and back down to Bourg.
https://uk.bike-oisans.com/equipement/villard-notre-dame-and-villard-reymond/