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EN ES FR IT
HC Where this climb is: IsèreAuvergne-Rhône-Alpes, France

Col de Porte

Southern ascent from Grenoble
GPX Profile
Length
14.8 km
Height gain
1096 m
Average
7.4%
Steepest km
10.3%
Summit altitude
1323 m
Difficulty
255
2 ways up · this is the hardest Compare all 2

Elevation profile

227 m → 1323 m Touch or hover to inspect
Elevation profile: Col de Porte from Grenoble
0–4% 4–6% 6–8% 8–10% 10–14% 14%+
Steepest km: km 2 at 10.3%

Climb analysis

Where the climbing is

0–4%
1.6 km
4–6%
2.0 km
6–8%
5.8 km
8–10%
3.8 km
10–14%
1.5 km
14%+
0.3 km

Hardest sustained

1 km · km 0.6–1.6
10.6%
2 km · km 3.6–5.6
9.7%
5 km · km 0.6–5.6
9.1%

Time to the top

1h 15 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%
1 300 m 7.2%
2 402 m 10.3%
3 481 m 7.9%
4 571 m 9.0%
5 664 m 9.2%
6 752 m 8.8%
7 801 m 4.9%
8 874 m 7.3%
9 945 m 7.1%
10 986 m 4.1%

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 de Porte

How long and how steep?
From Grenoble, Col de Porte is 14.8 km long and climbs 1,096 m at an average of 7.4%, to a summit at 1,323 m. Its steepest kilometre, km 2, averages 10.3%.
How long does it take?
At 3 W/kg it takes about 1 h 15 min to reach the top, at 4 W/kg about 58 min (70 kg rider, 8 kg bike, no wind).
What category is it?
It's an HC (hors catégorie) climb, with a difficulty score of 255. It's the hardest of the 2 ways up to Col de Porte.
Where is it?
It's in Isère, Auvergne-Rhône-Alpes, France.

How hard is 255?

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

Alto del Nacimiento, Purchena 256
Superbagnères de Luchon, Bagnères-de-Luchon 255
Col de Porte, Grenoble 255
Collado del Alguacil, Guejar Sierra 254
Alto del Moncalvillo, Entrena 254

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Added by Thutmose · 1 contributor

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