The Côte d'Ereffe climbs from the Hoyoux valley towards Grand-Marchin, passing through the wooded lower setting of the Val d'Ereffe before reaching the more open ground above. The selected road includes the fuller valley-to-plateau approach, rather than the shorter climbing profile stored alongside it. That extent matters to the atmosphere of the ride: the ascent begins within the folds of the valley and gradually exchanges them for a broader view of the country around Marchin.
The selected climb lasts about 2.2 kilometres, gaining roughly 121 metres. Its length allows a steadier rhythm than the brief ramps elsewhere in the collection, while variations in slope keep the ascent from becoming mechanical. The transition out of the trees gives the higher road a sense of arrival even before the selected endpoint is reached. Ereffe is an understated climb, with the changing relationship between valley, woodland and upper countryside providing much of its pleasure.
01 / The ascent
Elevation profile
02 / The crux
Where it gets difficult
Choose a distance to find the steepest continuous section of the climb.
Steepest 500 m average
7.3%
Where to find it
0.20–0.70 km from start
- Net height gained
- 36 m
- Section length
- 500 m
03 / The numbers
Climb statistics
- Distance
- 2.17 km
- Elevation gain
- 121 m
- Average gradient
- 5.7%
- Climb category
- 4
- Start elevation
- 144 m
- Summit elevation
- 265 m
04 / Your effort
How long would it take?
Enter the power you could hold for the whole climb. We calculate a moving time from the elevation profile and the forces you ride against.
Use your intended climbing effort, rather than FTP unless you can hold it for the predicted duration.
Bike + kit includes clothing, bottles and luggage.
Advanced settings
Defaults represent a road-bike scenario. Adjust these settings to match your tyres, drivetrain and riding position.
Modelled moving time
9 min
- Power throughout
- 225 W
- Average speed
- 14.8 km/h
Based on the 2.18 km elevation profile. Assumes steady power, with no stops, braking or drafting. Rounded to the nearest minute.
The science behind the calculation
For each part of the stored profile, we solve the steady-state cycling power equation for speed, then add distance ÷ speed across the climb. Gravity uses rider + equipment weight; available power is W/kg × rider weight. This uses the profile’s distance and elevation together, without mixing in another route’s metrics.
Power × efficiency = gravity + rolling resistance + air resistance + bearing losses
The resistance equations are adapted from Martin et al. (1998), Validation of a Mathematical Model for Road Cycling Power. Air density changes with profile altitude using NASA’s standard-atmosphere model. This calculator’s adaptation has not been independently validated.
It predicts travel at the power you enter, including on descents. It does not model acceleration, cornering, braking, traffic, wind, changing weather or fatigue. At altitude, choose power you can sustain there: thinner air reduces drag, but this model does not predict its effect on your ability to produce power. Profile quality and assumed equipment settings also affect the result.
05 / On the ground
Route map
Route overview
Côte d' Ereffe
Marchin, Région Wallonne, Belgium
- Route length
- 2.17 km
- Total ascent
- 121 m
- Average gradient
- 5.7%
06 / Take it home
The climb, as artwork
Turn the route into a personalised topographic print. Choose your colours and composition, then download your artwork.
07 / Keep exploring
Nearby climbs
Route du Ham
1.4 km · 5.6% · 88 m gain
Esneux, Walloon Region, Belgium
22.1 km away · Explore climb →
Côte de Beffe
1.5 km · 9.0% · 135 m gain
Rendeux, Région Wallonne, Belgium
31.8 km away · Explore climb →
Côte du Doyard
0.5 km · 6.1% · 31 m gain
Sprimont, Walloon Region, Belgium
32.8 km away · Explore climb →
Oude Berg Burchtheuvel
0.4 km · 5.1% · 24 m gain
Borgloon, Vlaams Gewest, Belgium
36.1 km away · Explore climb →
Côte de Blegny
1.9 km · 4.2% · 81 m gain
Blégny, Région Wallonne, Belgium
38.7 km away · Explore climb →