4.7
(22)
172
riders
17
rides
Mountain bike trails around Sem offer a diverse landscape for riders, characterized by extensive trail networks within forests and natural preserves. The region features varied terrain, including singletrack paths with roots, switchbacks, and off-cambered sections. Riders can also encounter man-made elements like small drops and rollers, providing technical challenges. These trails often include moderate climbing and descending sections with short, steep pitches.
Last updated: July 4, 2026
4.5
(2)
24
riders
37.9km
03:38
1,170m
1,170m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
5.0
(2)
15
riders
54.7km
05:13
1,650m
1,650m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

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5.0
(1)
11
riders
38.3km
05:16
1,760m
1,760m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
4.4
(5)
19
riders
40.3km
03:50
1,240m
1,240m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
4.0
(1)
18
riders
35.0km
03:41
1,290m
1,290m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
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It is a MUST of the Pyrenees, without a doubt, that should be included in any route that crosses the Pyrenees from side to side. Any of its slopes 2 is spectacular and tough. The views from its summit are wonderful, feeling the wild side of the Pyrenees. Of course, once at the summit of this pass... you have to descend to the Étang de Lers and enjoy a quiet rest on the shores of the lake. It is a pass that has been part of the Tour de France route on several occasions, although always far from the finish line. The first professional rider to crest it in the lead was the unforgettable Marco Pantani in 1995.
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I liked the climb from the north side (from Massat), very scenic and alpine landscapes towards the end at the étang de Lers
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Awesome, endless S2 trail with a few S3 cruxes. Awesome!
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Beautiful view of the surrounding peaks.
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Hike to do with a very good full suspension mountain bike or 🥾🎒
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superb view of the ridges and beautiful descent to Sem
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The Port of Lers is a crossing point which offers a beautiful panorama where you may be lucky enough to see Mertens black horses. It is also a place which has seen the Tour de France pass many times.
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Mountain bike trails in Sem offer a diverse landscape, primarily within forests and natural preserves. You'll encounter varied terrain, including singletrack paths with roots, switchbacks, and off-cambered sections. Some routes also feature man-made elements like small drops and rollers, providing technical challenges. Expect moderate climbing and descending sections, often with short, steep pitches.
There are 18 mountain bike trails around Sem, offering a range of experiences for different skill levels.
While Sem is known for its more challenging routes, there are 5 moderate mountain bike trails available. These offer a good starting point for riders looking to build their skills before tackling the more difficult terrain.
The mountain bike trails in Sem are highly rated by the komoot community, with an average score of 4.7 stars from over 19 reviews. Riders often praise the extensive trail networks, varied terrain, and immersive forests and natural preserves.
Yes, many routes in Sem are circular. For example, the Pic de Risoul – Siguer loop from Val-de-Sos is a popular difficult circular route covering 23.5 miles. Another option is the Siguer – Col de Grail Refuge loop from Siguer, a challenging 25.8-mile loop.
For longer rides, consider the Siguer – Col de Grail Refuge loop from Siguer, which is 25.8 miles (41.6 km) long. Another extensive option is the Col de Grail Refuge – Viewpoint loop from Val-de-Sos, spanning 25.5 miles (41 km).
Sem offers 13 difficult mountain bike trails for advanced riders. A challenging option is the Col de Grail Refuge – Pic de Risoul loop from Val-de-Sos, which features significant elevation gain over 17.7 miles (28.5 km).
While riding in Sem, you can encounter various natural features and landmarks. These include mountain peaks like Saleix Pass and Three Lords' Peak. You might also pass by huts and refuges such as Étang Fourcat and Refuge de l'Étang Fourcat, or the Orri of La Coume Izourt.
Yes, some routes incorporate downhill sections. The Lapégu Village – Lapège to Junac Downhill MTB loop from Val-de-Sos is a moderate 12.9-mile trail specifically designed with downhill mountain biking in mind, leading through forested areas.
Ride durations vary depending on the trail's length and difficulty. For instance, the moderate Lapégu Village – Lapège to Junac Downhill MTB loop from Val-de-Sos typically takes about 2 hours 4 minutes, while more difficult and longer routes like the Pic de Risoul – Siguer loop from Val-de-Sos can take around 3 hours 37 minutes.


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