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Take the cycle path north towards Fiames - Cimabanche. After the second tunnel, turn sharp left and you will come to the SS51 main road. Continue steeply up to the Ra Stua hut then turn left after 100m.
A technical descent with a fairly even surface takes you to a bridge over the Boite torrent. Glide down through the meadows of Pian de Loa and, at the bottom, bear left to Fiames. Return to Cortina along Pian de Ra Spines.