Hertzian Tower – Crête de Brie loop from Jarrie-Vizille

Mountain biking trails

Hertzian Tower – Crête de Brie loop from Jarrie-Vizille

Hard

riders

Hertzian Tower – Crête de Brie loop from Jarrie-Vizille

03:20

38.9km

800m

Mountain biking

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike. The starting point of the route is accessible with public transport.

Last updated: August 25, 2026

Tips

Includes a segment that may be dangerous

A part of this route comprises technical, difficult, or hazardous terrain. Specialist equipment and prior experience may be required.

After 19.8 km for 47 m

Waypoints

Start point

Train Station

Get Directions

656 m

Ascent to Château de Bon Repos

Highlight • Climb

This tour is very nice and varied.
A little technical at the Saut du Moine with a big rocky step that you can go around on the right or cross by portage.

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7.38 km

Hertzian Tower

Highlight • Monument

12.6 km

Roman Road

Highlight • Historical Site

The slope is quite steep and with a lot of rocks, but it can be climbed without putting your foot down. It's not particularly fun to descend. Better to take the surrounding enduro trails.

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13.4 km

Viewpoint

20.0 km

Crête de Brie

Highlight (Segment) • Trail

the beginning of the track is in rock with fairly high steps, without major difficulties in summer in dry weather, more technical when very wet

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22.8 km

View of Oisans-Romanche from the Uriage Ridge Towards Brié-et-Angonnes and Herbeys

Highlight • Viewpoint

small, easy path, which offers a very pretty viewpoint

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25.5 km

Château d'Erbeys

Highlight • Other

The castle is not open to the public. It's a shame, as the site is exceptional. The earliest remains date back to the 14th century, when the castle was owned by the Bishop of Grenoble.
Today, it is privately owned.

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Tip by

30.1 km