Col du Tronc – Legendary Mountain Passes
For the first few kilometres, you follow the inverse route itinerary of the Col du Lein from the Val de Bagnes. The Col du Tronc summits on the ridge that links the Col des Planches to the Col du Lein. This atypical climb completes this triple ascension of the mountain.
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From the Val de Bagnes, the Col du Tronc heads towards the summit of the Pierre Avoi through the mountain pastures. The 11.6 kilometres of climbing to 1,606 metres of altitude are on a steady slope for the length of the ascent. The peculiarity of this pass is that the second half of the course is on dirt road. Therefore, it will delight gravel bike users as well as adventurous road cyclists! At the summit of the pass, you have the possibility of turning left towards the Col des Planches below or right in order to climb to the summit of the Col du Lein just a few hundred metres above.