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Col de Porte from Grenoble

18 km road cycling route1,110 m climbing1 h 16 minGPX

Grenoble, France · Road

A mountainous 18 km road cycling route from Grenoble through La Tronche, Maubec and Corenc, with 1,110 m of climbing over the La Tronche climb.

Routed from the map This classic road was traced on OpenStreetMap and measured against the terrain model; no member has recorded it yet. Ridden it? Add your recording and photos.

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At a glance

Best for
Short, climbing-heavy rides
Distance
17.7 km
Point to point
Elevation gain
1,110 m
63 m per km
Riding time
1 h 16 min
moving time, estimated
Difficulty
Moderate
Bike
Road bike
Surface
Paved
Best months
Apr to Oct
Grenoble climate, 10 years
Navigation
GPX download
free, no sign-in
Start → finish
Grenoble

Map and elevation profile

Roadsign of the col de Porte pass, in the Chartreuse mountains, in Isère, France.
Photo: Florian Pépellin · CC BY-SA 3.0 · Wikimedia Commons

Elevation profile

Total ascent
1,110 m
Distance
18 km
05001,0001,500m0 km5101518 km1,324 m · highest, at 17.7 kmStartFinish

Route description

  1. Grenoble
  2. La Tronche climbkm 2
  3. La Tronchekm 3
  4. Maubeckm 4
  5. Corenckm 6
  6. Château Pilonkm 9
  7. Vencekm 10
  8. Pillonnièrekm 12
  9. Le Sappey-en-Chartreusekm 13

Starting near Grenoble, the route ascends over 15.4 km from 2.2 km into the ride, gaining 1102 m of elevation up to 1323 m at the Col de Porte. The climb is steep with an average gradient of 7.2% and a maximum of 14.4%. Nearly all the route is paved with 99% paved surface and just 1% unmapped.

The roads consist mainly of main roads (68%) including 13.9 km on the D 512, with 12.1 km on main roads without a cycle lane and 5.7 km on roads with speed limits over 80 km/h. There are cycle lanes for 2.2 km and smaller portions of path, minor road, and quiet street. Facilities near the start in Grenoble include bakeries, cafés, a bike shop, and toilets. Along the climb, water is available at 2.3 km, 7.3 km, 10.8 km, and at the summit. Shops and cafés are near 5.6 km and 13 km. The longest stretch without café, shop, or water is 4.2 km between 13.5 km and the finish. The route ends at Col de Porte with café and restaurant options.

Why ride this route?

  • Climbs the La Tronche climb (15.4 km at 7.2 %).
  • Tops out at 1,323 m, 17.6 km in.

Highlights

  • Steep 15.4 km climb to 1323 m at Col de Porte
  • Route mainly on D 512 main road
  • Water points at 2.3 km, 7.3 km, 10.8 km, and summit
  • Nearby facilities in Grenoble start and Col de Porte finish

Along the route

Measured from the route line, the Copernicus elevation model and OpenStreetMap.

Places passed

  1. La Tronche 3.3 km
  2. Le Gorget 4 km
  3. Maubec 4.3 km
  4. Bouqueron 4.7 km
  5. Corenc 5.6 km
  6. Bâtonnière 8.5 km
  7. Château Pilon 8.5 km
  8. La Chapelle 9 km
  9. Vence 10 km
  10. Le Bret 10.2 km
  11. Pillonnière 11.5 km
  12. Boulière 12 km
  13. Le Sappey-en-Chartreuse 13.1 km
  14. Sarcenas 15.2 km

On the road

  • Water 0 km
  • Water 0 km
  • Pizza for you (Restaurant) 0 km
  • Water 0 km
  • L'Orangerie Perchée (Restaurant) 0 km
  • L'Orangerie Perchée (Restaurant) 0 km
  • Water 0.1 km
  • Water 0.1 km
  • Water 0.1 km
  • Café Stendhal (Café) 0.3 km
  • L'Odace (Restaurant) 0.3 km
  • Les Toqués (Café) 0.3 km

Climbs

Climbs in ride order: where each starts, what this ride climbs, and the full named ascent
ClimbStarts atOn this rideFull ascentTop on this ride
La Tronche climb2.2 km15.4 km · 1102 m · 7.2 % · max 14.4 %15.4 km · 1102 m · 7.2 %1323 m

High point 1323 m at 17.6 km; low point 213 m.

On this ride: the part this route climbs, cut from its own elevation profile. Full ascent: the whole named climb, measured the same way on every ride that uses it (its climb page).

La Tronche climb · full ascent, starts at 2.2 km

15.4 km at 7.2% · 1102 m
4006008001,0001,200m8.3%9.0%7.4%11%4.1%9.0%3.9%5.7%7.7%8.4%7.0%6.4%0 km123456789101112131415.4 km1,323 msteepest 11.1%
< 4%4 – 7%7 – 10%> 10%

Know before you go

  • 12.1 km on main roads without cycle lanes
  • 5.7 km on roads with 80 km/h+ speed limit
  • 4.2 km without café, shop or water from 13.5 km

Routes are for inspiration. Roads, surfaces and conditions change — check locally and ride within your limits.

2 photographs from the road

Photo: Florian Pépellin · CC BY-SA 3.0 · Wikimedia Commons · Photo: Remontees · CC BY-SA 4.0 · Wikimedia Commons

About this route

Route line
Routed on OpenStreetMap roads with bicycle routing, then measured like a recorded ride.
Elevation
Recalculated from the Copernicus GLO-90 terrain model every 50 m, not the device’s barometer.
Best months
Ten years of ERA5 weather for Grenoble (Open-Meteo).
GPX
Generated from the route line: track points only, no timestamps or personal data.
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