Sierra del Rincón Biosphere Reserve Loop

This route is considered difficult, designed for experienced road cyclists with good to very good fitness. It features significant elevation changes, including challenging mountain passes like the Puerto de La Hiruela, which has a demanding climb of 6.5 km with an average gradient of 5.4%.

You will encounter high mountain landscapes, deep valleys, and forested areas. While many roads, especially on mountain passes, have good asphalt, be aware that some segments, even on routes categorized for road biking, may be unpaved and difficult to ride. Expect a constant mix of ascents and descents throughout the loop.

The route offers a variety of scenic and historical highlights. You'll pass through picturesque settlements like Montejo de la Sierra and La Serna del Monte. Other notable spots include the Buitrago del Lozoya Castle and Walls, the Puentes Viejas Dam, and a scenic Descent to the Río Jaramilla.

The Sierra de Guadarrama region is best enjoyed during the spring and autumn months. These seasons offer more moderate temperatures and vibrant natural scenery. Summer can be very hot, especially at lower elevations, while winter may bring snow and ice to the higher passes, making cycling challenging or impossible.

The route passes through the Sierra del Rincón Biosphere Reserve. Generally, no specific permits are required for cycling on established roads. However, it's crucial to respect local regulations, stay on marked paths, and practice Leave No Trace principles to protect the natural environment. There are no entrance fees for the reserve itself.

While the route is primarily on roads, which are generally accessible, it is a challenging road cycling tour. Bringing dogs along on a bicycle, especially for such a long and difficult route, is not typically recommended. If you plan to bring a dog, ensure they are safely secured and that you comply with any local leash laws or regulations in villages and protected areas.

As this is a circular route, you can typically start and park in one of the villages along the way, such as La Hiruela or Somosierra. Parking availability may vary, especially on weekends or holidays, so arriving early is advisable. Look for designated parking areas within the villages.

Yes, this route briefly overlaps with sections of several other paths. You'll find yourself on parts of the [CIMA MA10] La Puebla * La Hiruela, [CIMA GU04] Peñalba * La Hiruela, and the [CIMA MA10] La Puebla * Prádena del Rincón. It also touches segments of the GR-88 and El Barranco de El Jarama.

Yes, you'll pass through several villages where you can find cafes, restaurants, or small shops. La Hiruela itself is known for its charming atmosphere and traditional architecture, offering options for a break. Montejo de la Sierra and Buitrago del Lozoya are also good spots to refuel.

Given the route's difficulty and length, bring plenty of water and snacks, as well as appropriate cycling gear for varying weather conditions. A repair kit, spare tubes, and a pump are essential. A GPS device with the route loaded is highly recommended, as is a fully charged phone. Don't forget sun protection and layers of clothing.

Public transport options to the villages in the Sierra Norte de Madrid, such as La Hiruela or Somosierra, are limited, especially for cyclists with bikes. While some bus lines serve these areas, schedules can be infrequent. It's generally more convenient to travel by car to the starting point.