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2 Where this climb is: LoireAuvergne-Rhône-Alpes, France

Col du Grand Bois

North-western ascent from Saint-Ètienne
GPX Profile
Length
12.9 km
Height gain
571 m
Average
4.4%
Steepest km
7.3%
Summit altitude
1159 m
Difficulty
95

Elevation profile

588 m → 1161 m Touch or hover to inspect
Elevation profile: Col du Grand Bois from Saint-Ètienne
0–4% 4–6% 6–8% 8–10% 10–14% 14%+
Steepest km: km 1 at 7.3%

Climb analysis

Where the climbing is

0–4%
4.4 km
4–6%
6.0 km
6–8%
2.5 km
8–10%
0.0 km
10–14%
0.0 km
14%+
0.0 km

Hardest sustained

1 km · km 0.0–1.0
7.3%
2 km · km 0.0–2.0
7.1%
5 km · km 0.0–5.0
6.3%

Time to the top

0h 44 at 3 W/kg · 70 kg rider + 8 kg bike, no wind
How this is calculated

Kilometre by kilometre

Export CSV
Km Altitude Gradient 0–15%
1 661 m 7.3%
2 731 m 7.0%
3 788 m 5.7%
4 844 m 5.7%
5 904 m 5.9%
6 960 m 5.7%
7 1009 m 4.8%
8 1041 m 3.2%
9 1055 m 1.4%
10 1067 m 1.2%

Route map

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Directions
Satellite
Road surface not mapped yet Report a road type
No tunnels mapped Map a tunnel

About Col du Grand Bois

How long and how steep?
From Saint-Ètienne, Col du Grand Bois is 12.9 km long and climbs 571 m at an average of 4.4%, to a summit at 1,159 m. Its first kilometre is the steepest, at 7.3%.
How long does it take?
At 3 W/kg it takes about 45 min to reach the top, at 4 W/kg about 36 min (70 kg rider, 8 kg bike, no wind).
What category is it?
It's a category 2 climb, with a difficulty score of 95.
Where is it?
It's in Loire, Auvergne-Rhône-Alpes, France.

How hard is 95?

Difficulty score is length × gradient, weighted for the steepest kilometre.

Navafría, Ceguilla 95
Sierra de Altomira, Zorita de los Canes 95
Col du Grand Bois, Saint-Ètienne 95
Col de Montgenèvre, Briançon 95
Col de la Hourquette ouest, Payolle 95

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Added by Thutmose · 1 contributor

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