Start from the top station of the Pierrafort cable car (see timetables and fares in the practical information section).
The walk leads to two passes, with a long section common to both routes up to an unnamed small pass (6). The description below lists these two passes in a particular order, but it is of course possible to do them in the reverse order or to visit just one of them.
Ascent to the small pass
(S/E) With your back to the cable car’s arrival station, head towards a small chalet; leave this chalet on your right, take a footbridge and cross a torrent. Then follow a track heading north-east, which climbs gently in a zigzag pattern up to the Col du Gollet.
(1) At the pass, the track turns sharply right (south-south-west) towards the Col du Mottet (signposted). Continue along the track (the path shown in purple on the 1:25,000 map, which is supposed to pass at elevation 2131, does not exist).
(2) At the junction at a place called La Montagne du Gollet (signposted), continue along the track (ignore a path branching off to the left which is not shown on the 1:25,000 map but is visible if you zoom in further). Pass at the foot of the Pointe du Grand Niélard (boulders), and take two hairpin bends, first to the right then to the left, to climb a grassy ridge.
(3) Descend amongst boulders, then climb a short, steep section. Continue west-south-west and pass beneath the Mottet chairlift line.
(4) Continue along the gently ascending track, heading south-west then west (the junction marked here is only for an alternative descent route).
(5) Ignore a trail starting on the left and stay on the same trail, which becomes steeper. After a few hairpin bends, reach a small pass (unnamed on the map) directly below a large ski trail signpost.
Route to the Col de Riondet
(6) With the signpost on your left, follow the path on the right which begins to descend. At the next Fork in the road, take the left-hand track which climbs steeply up the slope. The climb then becomes less steep until you reach the pass.
(7) From the Col de Riondet, the return to the small pass is via the same path.
Route to the Col du Mottet
(6) With the signpost on your left, follow the path on the left, which climbs and passes level with the signpost. Follow a few hairpin bends, then continue up a gentle slope to the pass.
(8) From the Col du Mottet, the return to the small pass is via the same path.
Descent to the cable car from the unnamed small pass
(6) Follow the same path as on the ascent but in the opposite direction to return to the Pierrafort cable car top station (S/E).