Cols of la Machine, Carri, and Herbouilly Loop

This route is considered a "difficult" road ride, demanding a very good level of fitness. It features significant elevation gain across three major cols: Col de la Machine, Carri Pass, and Col d'Herbouilly. Expect continuous gradients, with some sections reaching 8-9% on the Col de la Machine and short, sharp inclines of 10-11% on the Carri Pass.

The route offers breathtaking scenery throughout the Vercors massif. A major highlight is the "balcony road" section of the Col de la Machine, known as Combe Laval. This narrow road, cut into the mountain face with sheer cliffs, provides stunning views and includes tunnels and natural arches. You'll also find pleasant scenery opening up towards the end of the Carri Pass, and depending on your approach to the Col d'Herbouilly, clear views of the Gorges de la Bourne or the magnificent Prairie d'Herbouilly.

The best time to cycle this route is typically from late spring through early autumn (May to October) when the weather is generally more stable and the mountain passes are clear of snow. Always check the local weather forecast before you go, as conditions in the mountains can change rapidly.

The route primarily features well-paved surfaces, making it ideal for road bikes. However, be aware that some roads, particularly on the Col d'Herbouilly, can be narrow. You'll encounter a diverse mix of challenging ascents, exhilarating descents, and some flatter sections as you traverse the Vercors landscape.

Generally, there are no specific entrance fees for cycling within the Parc naturel régional du Vercors. However, as a protected natural area, it's important to respect local regulations, such as staying on marked roads and trails, not disturbing wildlife, and practicing Leave No Trace principles. Always check the park's official website for any updated rules or specific permits required for certain activities or areas.

Yes, this route overlaps with sections of several other official trails. You'll find yourself on parts of the P'tites Routes du Soleil, étape 10, Villard-de-Lans / Die, Coeur de Vercors, Grand Tour du Vercors, and Au Fil de la Bourne, among others.

No, this route is not recommended for families with young children or beginner cyclists. It is classified as a "difficult" road ride, requiring very good fitness due to its significant elevation gain and challenging gradients across multiple mountain passes. There are likely more suitable, less demanding cycling options elsewhere in the Vercors for those seeking a more relaxed experience.

While the exact starting point can vary, many cyclists begin their Vercors adventures from towns within or around the park. For this specific route, you would typically look for parking in a town that provides good access to the initial climb, such as Pont-en-Royans or a nearby village. Public parking is usually available in these towns, but it's advisable to check local regulations and availability, especially during peak season.

Yes, the Vercors region has various villages and towns that offer cafes, restaurants, and accommodation options. You'll find amenities in towns like Pont-en-Royans, and other villages along or near the route. It's a good idea to plan your stops in advance, especially if you're looking for specific services or during off-peak seasons when some establishments might have reduced hours.

Given the route's difficulty and mountain environment, appropriate gear is crucial. Wear comfortable cycling attire suitable for varying temperatures, including layers. A helmet is essential. Bring plenty of water, energy snacks, a repair kit for your bike, and navigation tools (like a GPS device or the komoot app). Sunscreen, sunglasses, and a light rain jacket are also highly recommended, as mountain weather can be unpredictable.

This is a road cycling route, and while dogs are generally allowed in the Parc naturel régional du Vercors, bringing a dog on a challenging road bike tour of this nature is not practical or safe. If you are looking for dog-friendly activities in the Vercors, consider hiking trails where dogs are permitted, often on a leash, but this specific cycling route is not suitable for canine companions.