Côte de Haut-Bois: Cycling Climb

The climb · Belgium

About Côte de Haut-Bois

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Hellingen

The Côte de Haut-Bois follows Rue du Chaumont southwards in the municipality of Gesves, rising towards the higher ground around Haut-Bois. Its gentle lower slopes make the beginning feel more like an approach than the centre of the climb. The road curves gradually as it gains height, and the increase in effort comes in stages rather than arriving with one abrupt change at the start.

Over about 1.6 kilometres, the average gradient is roughly 5%. The middle carries substantially more of the climbing than the opening, with a stronger stretch in the second half before the road eases towards the finish. That late softening gives the ascent a clear sense of release, even though the height continues to accumulate. Haut-Bois is a short climb whose changing slope gives it more character than its restrained average suggests.

01 / The ascent

Elevation profile

Start 179 m · Summit 258 m

Gradient by distance1.60 km / 80 m gain

0 km0.3 km0.6 km1 km1.3 km1.6 km

02 / The numbers

Climb statistics

Distance: 1.60 km
Elevation gain: 80 m
Average gradient: 5.0%
Climb category: Uncategorized
Start elevation: 179 m
Summit elevation: 258 m

Current weather

At the climb start

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Weather data: MET Norway

03 / 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.

Sustained power

W/kg

Use your intended climbing effort, rather than FTP unless you can hold it for the predicted duration.

Rider weight (kg)

Bike + kit weight (kg)

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.

Effective drag area (CdA) (m²)

Rolling resistance (Crr)

Drivetrain efficiency (%)

Modelled moving time

6 min

Power throughout: 225 W
Average speed: 15.8 km/h

Based on the 1.60 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.

04 / On the ground