This approach to the Rosier begins at Ruy, on the eastern side of the col, and climbs towards the wooded high ground above the valley. It follows the eastern ascent rather than the separate southern route from La Gleize. The road passes through Andrimont, giving the climb a sequence of woodland, open pasture and settlement before the trees close around it again.
The selected ascent is about 4.4 kilometres long, enough for the surroundings and the effort to change gradually. The lower climbing asks more than the gentler upper portion, although the road continues gaining height as it approaches the col. The mixture of open hillside and woodland gives it more variety than a climb enclosed by trees throughout. Rosier's eastern approach offers a sustained rise with a clear change of mood along the way. It is the quieter details of the landscape that make the distance worthwhile.
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
7.1%
Where to find it
0.20–0.70 km from start
- Net height gained
- 35 m
- Section length
- 500 m
03 / The numbers
Climb statistics
- Distance
- 4.42 km
- Elevation gain
- 255 m
- Average gradient
- 5.8%
- Climb category
- 3
- Start elevation
- 304 m
- Summit elevation
- 559 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
18 min
- Power throughout
- 225 W
- Average speed
- 14.6 km/h
Based on the 4.42 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
Rosier
Stoumont, Région wallonne, Belgium
- Route length
- 4.42 km
- Total ascent
- 255 m
- Average gradient
- 5.8%
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
Thier de Coo
2.5 km · 8.5% · 210 m gain
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5.1 km away · Explore climb →
Côte de Brume-Est
2.5 km · 8.1% · 202 m gain
Trois-Ponts, Wallonie, Belgium
7.0 km away · Explore climb →
Côte du Doyard
0.5 km · 6.1% · 31 m gain
Sprimont, Walloon Region, Belgium
18.0 km away · Explore climb →
Route du Ham
1.4 km · 5.6% · 88 m gain
Esneux, Walloon Region, Belgium
26.0 km away · Explore climb →
Monschaustraße
0.6 km · 5.8% · 42 m gain
Monschau, Nordrhein-Westfalen, Germany
28.1 km away · Explore climb →