Col du Bac from Ajac
Col du Bac from Ajac: 12.7 km at 3.8% average and 485 m of climbing, up to 620 m.
- Distance
- 12.7 km
- Elevation gain
- 485 m
- Elevation loss
- 102 m
- Average gradient
- 3.8 %
- Start altitude
- 236 m
- Road
- Departmental road
- Surface
- Paved throughout
- Steepest 500 m
- 8.3 %
- Hardest 2 km
- 6.0 %
- Hardest kilometre
- km 6 · 6.8%
- Above 8%
- 1.2 km (9% of the climb)
- Difficulty index
- 1.2 Easy
FIETS index: Δaltitude² / (10 × distance) + max(0, summit altitude − 1,000) / 1,000, lengths in metres. How this index works (article in French)
How long does it take?
| Level | Estimated time | Average speed |
|---|---|---|
| 2.0 W/kg — 140 W | 57 min | 13.4 km/h |
| 3.0 W/kg — 210 W | 41 min | 18.6 km/h |
| 4.0 W/kg — 280 W | 33 min | 22.9 km/h |
Estimated for a 70 kg rider on a 9 kg bike, in still air, at a steady effort and without stopping. Wind, a stop at the fountain or a wheel to sit on move these figures by several minutes.
The route
Climb profile
- 10% and above
- 8 to 10%
- 6 to 8%
- 4 to 6%
- under 4%
Kilometre by kilometre
| Km | Gradient | Altitude at the top of the km |
|---|---|---|
| 1 | 3.8 % | 274 m |
| 2 | 4.4 % | 317 m |
| 3 | 4.0 % | 357 m |
| 4 | 5.6 % | 413 m |
| 5 | 4.7 % | 460 m |
| 6 | 6.8 % | 528 m |
| 7 | -2.1 % | 506 m |
| 8 | -1.7 % | 489 m |
| 9 | -3.1 % | 458 m |
| 10 | 1.9 % | 477 m |
| 11 | 5.5 % | 532 m |
| 12 | 5.3 % | 585 m |
| 13 (partial) | 4.7 % | 619 m |
Download the GPX track All climbs of this col
The other climbs of this col
- From Chalabre 4.4 km · 5.1 %
Frequently asked questions
How long is the climb to Col du Bac?
The hardest climb of Col du Bac, from Ajac, is 12.7 km long for 485 m of ascent, i.e. 3.8% average.
What is the steepest part of Col du Bac?
The steepest 500 m sits at 8.3%, and the hardest kilometre is the 6th, at 6.8%.
How long does it take to climb Col du Bac from Ajac?
Col du Bac from Ajac takes about 41 min at 3.0 W/kg, i.e. 18.6 km/h on average. The page gives three levels and their assumptions.
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