Immediately after the last houses of the San Giacomo hamlet, take the left along the steep, narrow road (Via del Tus) to the Bercia hill. A kilometre or so further on, leave the crossroads keeping to the right. Proceed parallel to the Colla valley below until the end of the road (this first stretch can also be taken by car if the road is not blocked by snow).

The central Spur is now clearly visible from here: wearing skis, reach the Spur by proceeding up to the last houses - by now long uninhabited - at an altitude of around 1,150 m. Continue on the cart track which climbs steeply along a kind of ridge lined with splendid beech trees: on coming out of the forest, take a long diagonal ascending traverse (traces of the path are visible) and reach an evident small hill at the base part of the spur, just above the tree line.

From here, the spur becomes steeper, with slopes increasing from 20° to over 30° in the upper section. This requires good climbing technique and perhaps even using crampons if the snow is firm or frozen.

At first, climb along the edge, passing by several outcrops of Besimaudite (Bisalta stone). Then move to the left on a broad slope and finally, pass by a small hill facing south-west along the final steep slope, with a drop in altitude of about 300 metres exposed in a deep gully.

Descend along the outward route. There are many variants along secondary gullies descending from the Central spur into the large depression that separates the latter from the Castellar spur.

Download Snowshoe and ski mountaineering itineraries in the Cuneo and Haute Provence Alps