🍄 a VTT – The observatory loop from Grignon
🍄 a VTT – The observatory loop from Grignon
4.7
(3)
30
riders
02:39
21.2km
980m
Mountain biking
Hard mountain bike ride. Very 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 right next to a parking lot.
Last updated: April 26, 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 12.0 km for 230 m
Waypoints
Start point
Parking
Get Directions
2.75 km
Highlight • Other
5.44 km
Forêt de Rhonne
Forest
11.8 km
Highlight • Mountain Pass
14.1 km
Highlight • Other
21.2 km
End point
Parking
Way Types & Surfaces
Way Types
12.9 km
6.89 km
1.33 km
< 100 m
Surfaces
6.96 km
6.44 km
4.67 km
2.13 km
497 m
465 m
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Elevation
Highest point (1,290 m)
Lowest point (340 m)
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Weather
Powered by Foreca
Sunday 17 May
14°C
6°C
87 %
Additional weather tips
Max wind speed: 3.0 km/h
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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.