4.5
(446)
3,609
riders
19
rides
Touring cycling around Trept, a commune in the Isère department of southeastern France, offers diverse landscapes within the Auvergne-Rhône-Alpes region. The area features varied elevations, ranging from 219 to 360 meters, providing routes with gentle climbs and descents. Cyclists can explore a rural setting characterized by limestone slabs and distinctive erratic boulders, remnants of the Ice Age. This environment combines natural beauty with historical sites, making it suitable for exploration on two wheels.
Last updated: August 8, 2026
4.8
(12)
62
riders
17.0km
01:10
110m
120m
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
4.7
(3)
22
riders
21.8km
01:24
110m
110m
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.

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5.0
(3)
14
riders
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.5
(4)
22
riders
46.6km
02:48
220m
220m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3.0
(1)
7
riders
31.2km
01:58
260m
260m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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In 1920, after the First World War, the Barron-Vialle company based in Lyon settled on a 100-hectare property on the edge of the Serre ponds [archive]. Founded by Antoine Vialle, it manufactured trucks, coaches, and luxury cars. The "conical gear axle" which replaced the chain drive on trucks was invented in the Vialle foundry in Arandon. Activity ceased in 1937[2],[3]. Between January 1939 and March 1940, the town's inhabitants lived through a little-known episode. After the fall of Barcelona to the Francoists on January 26, 1939, many Spanish refugees arrived in Grenoble, where they were very poorly housed. At the request of the authorities, in February 1939, Mr. Vialle, the mayor, agreed to rent out the premises of his inactive factory; from July 12 onwards, 1300 Spanish Republicans, mainly families[4] of refugees, were welcomed there and stayed until October. Two days after the declaration of war on September 3, 1939, the government of the Third Republic ordered the internment of men "nationals of enemy powers", considered suspicious. These were almost exclusively anti-Nazis, men, mostly Jewish refugees from Germany and Austria, who were interned from October 1939 under particularly harsh conditions. The camp is said to have closed its doors around February 1940, apparently by sending the last occupants, 90 Jews, to the Loriol camp on March 11. The activity of this center then ceased, a few months before the establishment of the Vichy regime on July 7, 1940[8]. Mr. Vialle was subsequently dismissed from his duties as mayor by the Vichy regime. The factory regained its purpose in 1946 with SOFAL (aluminum foundry) until its cessation of activity in 1967, with the factory being transferred to the company Pierre Calignon (cast iron foundry). The latter filed for bankruptcy in 1987 and was taken over by G-H Bouyer foundries, which permanently closed the site in 1993. The site was then used for storing tires and then chlorinated materials until its remediation[9]. srce wikipédia to learn more, https://ajpn.org/internement-Camp-d-Arandon-7.html
0
0
A nice little village, ideal for a break
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0
Neither the castle nor the park are open to the public
0
0
Meh, just good for walking around, no difficulty
0
0
Multi-purpose washhouse in the commune of Brangues. It is fed by the Reynieu stream. Its source is in Arandon.
1
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Trept offers a wide variety of touring cycling routes, with over 200 options available. These routes cater to different skill levels, including easy, moderate, and difficult paths, ensuring there's something for every cyclist.
The terrain around Trept is characterized by varied elevations, ranging from 219 to 360 meters, which means you'll encounter gentle climbs and descents. The landscape features limestone slabs and distinctive erratic boulders, remnants of the Ice Age, providing a unique and engaging environment for cycling.
Yes, Trept has 34 easy touring cycling routes perfect for beginners or those looking for a relaxed ride. These routes allow you to enjoy the rural setting without significant challenges. For example, the Crémieu–Morestel Greenway – Crémieu, medieval town loop from Trept is a moderate route that explores a local greenway and passes through a charming medieval town, offering a pleasant experience.
Absolutely. For experienced touring cyclists seeking a challenge, Trept offers 62 difficult routes. These often feature more significant elevation changes and longer distances. An example is the La Vanne d'Optevoz – La Roche Waterfall loop from Trept, which is a 31.4 miles (50.6 km) trail leading through rolling hills and natural areas with substantial elevation gain.
Trept's routes offer a blend of natural beauty and historical interest. You can encounter unique natural features like the erratic boulders known as the "Pierre de Dieu" and the "Pierre du Diable" within the Sensitive Natural Area of the Communaux de Trept. Historical landmarks include the 14th-century Chapel of Cozance, offering panoramic views, and the well-preserved 15th-century Château de la Serrières. You might also pass by the medieval town of Crémieu.
While specific 'family-friendly' designations aren't always explicit, many of the 34 easy routes around Trept would be suitable for families. Routes that stick to greenways or less trafficked rural roads, like sections of the Crémieu–Morestel Greenway, are generally good choices for a family outing.
Generally, dogs are welcome on many outdoor trails in France, especially if kept on a leash. However, it's always best to check local signage or specific route descriptions for any restrictions, particularly within protected natural areas like the Communaux de Trept, to ensure a pleasant experience for everyone.
Yes, many of the touring cycling routes around Trept are designed as loops, allowing you to start and end at the same point. Examples include the Crémieu–Morestel Greenway – Crémieu, medieval town loop from Trept and the Via Rhona – Brangues town centre loop from Trept, which offers views of the surrounding rural landscape.
While specific parking areas for each route are not detailed, as a charming commune, Trept likely offers public parking in or near the village center. For routes starting from Trept, look for designated parking areas in the village or near popular trailheads. For routes starting from nearby towns, similar parking options would be available.
Trept is a rural commune in the Isère department. Public transport options might be limited compared to larger cities. It's advisable to check local bus schedules or regional transport services for connections to Trept or nearby towns that serve as starting points for cycling routes. Planning ahead is recommended if relying on public transport.
The Auvergne-Rhône-Alpes region generally enjoys pleasant weather for cycling from spring through autumn. Spring (April-May) offers blooming flora, while autumn (September-October) provides comfortable temperatures and beautiful fall colors. Summer can be warm, but the varied elevations and rural setting often provide refreshing breezes. Winter cycling might be possible on lower elevation routes, but conditions can be colder and wetter.
The touring cycling routes around Trept are highly rated by the komoot community, with an average score of 4.4 stars from over 400 reviews. More than 3,700 touring cyclists have explored Trept's varied terrain using komoot, often praising the diverse landscapes, the mix of natural and historical sights, and the options for different difficulty levels.
Yes, one notable route that includes a waterfall is the La Vanne d'Optevoz – La Roche Waterfall loop from Trept. This challenging 31.4 miles (50.6 km) trail leads through rolling hills and natural areas, offering the chance to visit La Roche Waterfall as part of your touring cycling adventure.


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