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Road cycling routes

Auvergne Rhône Alpes

View of the Chartreuse – Cerin Peat Bog loop from Trept

Road cycling routes

Auvergne Rhône Alpes

View of the Chartreuse – Cerin Peat Bog loop from Trept

Hard

17

riders

View of the Chartreuse – Cerin Peat Bog loop from Trept

04:14

85.3km

1,270m

Road cycling

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is right next to a parking lot.

Last updated: June 19, 2026

Tips

The surface for a segment of your route may not be suitable

Some segments of your route comprise a surface that may not be suitable for your chosen sport.

After 21.1 km for 182 m

Waypoints

A

Start point

Parking

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1

1.38 km

View of the Chartreuse

Highlight • Other

On a clear day, of course 😉

Translated by Google •

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2

20.4 km

Start of the Col de Portes from Serrières-de-Briord

Highlight • Other

Sign for the start of the Col de Portes starting from Serrières-de-Briord, with indications of altitude, difference in altitude, average slope...

Translated by Google •

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3

24.7 km

Start of the Climb to Col de Portes

Highlight • Climb

Start of the climb towards the Col de Portes from Bénonces.

Translated by Google •

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33.2 km

Col de Portes

Mountain Pass

5

47.1 km

Cerin Peat Bog

Highlight • Other

Cerin Lake, also known as the Cerin Peat Bog, is subject to various environmental protections. The early development of its formation compared to other lakes in the Jura Mountains makes it a benchmark in the geological and climatic study of the region.

Translated by Google •

Tip by

6

61.9 km

Groslée Bridge

Highlight • Bridge

Bridge over Rhône which allows to pass from Ain to Isère, placed on Via Rhôna

Translated by Google •

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7

65.1 km

Paul Claudel's castles

Highlight • Castle

The property is private, but Paul Claudel's tomb is accessible

Showing Translation

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77.2 km

Bassin

Lake

B

85.3 km

End point

Parking

Way Types & Surfaces

Way Types

75.2 km

5.37 km

4.29 km

289 m

168 m

Surfaces

82.1 km

3.11 km

168 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (1,000 m)

Lowest point (200 m)

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Weather

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Wednesday 8 July

34°C

19°C

-- %

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