4.5
(20)
160
riders
16
rides
Gravel biking around Biert offers routes that utilize former railway lines, now converted into greenways, providing varied terrain for cyclists. The region features a network of paths that often include historical infrastructure like old tunnels and bridges. These routes traverse landscapes that combine open sections with areas of more dense vegetation, characteristic of the Ariège department. The terrain is generally suitable for gravel bikes, with options ranging from moderate to more challenging ascents.
Last updated: November 4, 2026
4.8
(8)
80
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
5.0
(4)
39
riders
141km
07:26
1,040m
1,040m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.

5.0
(3)
13
riders
53.4km
02:50
510m
510m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
4.0
(2)
11
riders
Moderate gravel ride. Good fitness required. Mostly paved surfaces.
5.0
(1)
7
riders
31.1km
01:43
280m
280m
Moderate gravel ride. Good fitness required. Mostly paved surfaces.
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Beginning or end of the railway cycle path „Voie Verte“ St. Girons - Foix or vice versa. A short section also serves to continue to (or from) Palmier. The Foix - Pamier route is neither signposted nor developed. But it can be easily ridden on small side roads.
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At the school, there is a tap on an outbuilding. When heading towards Foix, this is the last tap directly on the cycle path that we noticed. It makes sense to refill your supplies here.
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Trailhoulet du Vernajoul 10.5 kms
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A magnificent spot with the road winding under the rock, running alongside a partially underground stream. It's both breathtaking and peaceful. Plus, there's a starting point for a short walk; I did the beginning and it was lovely: I'd love to come back and do a longer section!
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Old little station that reminds us of another time!
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This is the longest tunnel on the greenway: it's super fun to go through. Be careful: it's a bit chilly!
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The gravel bike trails around Biert primarily utilize former railway lines, which have been converted into greenways. You'll encounter varied terrain, often featuring historical infrastructure like old tunnels and bridges. The routes traverse landscapes combining open sections with areas of denser vegetation, characteristic of the Ariège department.
While many routes in Biert are rated difficult, there are options for moderate skill levels. For example, the The tunnels of Véloroute 81 – Old Rimont Station loop from Castelnau-Durban is a moderate 32.5 km trail that takes about 2 hours 14 minutes, offering a good introduction to the region's greenways and historical points.
Gravel bike routes in Biert vary significantly in length. You can find shorter, moderate loops like the Old metal bridge – Greenway of Montels loop from Castelnau-Durban at 32.2 km, up to extensive, challenging rides such as the Foix–Saint-Girons Greenway – Foix loop from Rimont, which covers 141.2 km.
Yes, many of the gravel bike routes around Biert are designed as loops. Examples include the popular The tunnels of Véloroute 81 – Foix–Saint-Girons Greenway loop from Castelnau-Durban, which is a 80.7 km circular trail exploring sections of the Véloroute 81, and the Old metal bridge – Vernajoul Viaduct Greenway loop from Sentenac-de-Sérou.
The trails often incorporate historical elements. You can explore the tunnels of Véloroute 81 and ride along the Foix–Saint-Girons Greenway. Some routes also pass by points like the Old Rimont Station or offer views of structures like the Vernajoul Viaduct.
The gravel biking experience in Biert is highly rated by the komoot community, with an average score of 4.6 stars from over 17 reviews. Riders frequently praise the unique experience of cycling along former railway lines, the historical tunnels, and the varied landscapes of the Ariège department.
Yes, Biert offers several challenging routes for experienced gravel bikers. For instance, the Foix–Saint-Girons Greenway – Foix loop from Rimont is a difficult 141.2 km path with significant elevation gain, providing an extensive long-distance gravel experience.
There are 9 gravel bike routes documented around Biert, offering a range of experiences from moderate to difficult. This network provides ample opportunities to explore the region's greenways and historical infrastructure.
Given the region's characteristics with greenways and varied terrain, spring and autumn generally offer the most pleasant conditions for gravel biking in Biert, with milder temperatures and beautiful scenery. Summer can also be good, but it's advisable to start earlier to avoid the midday heat.
While specific viewpoints are not always marked, the routes often traverse open sections and elevated greenways, providing scenic vistas of the surrounding Ariège landscape. The historical bridges and viaducts themselves can offer picturesque spots.
The region's gravel routes often follow former railway lines, which can sometimes align with current public transport hubs in nearby towns. For specific route access, it's recommended to check local bus or train schedules for towns like Foix or Saint-Girons, which are connected by the main greenways.
Many gravel bike routes in Biert start from towns or villages like Castelnau-Durban or Rimont. These locations typically offer public parking facilities, especially near trailheads or town centers, making it convenient to access the greenways.


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