Cuitu Negru is deceptive: the first kilometres roll gently, teasing you into complacency. But the gradient increases, sharp and unrelenting, cutting into the legs and demanding respect.
The road winds through dramatic, rocky landscapes, the sky opening above as you climb. Each hairpin is a small victory, each straight a chance to steady the legs before the next punishment.
Summiting feels hard-earned, with panoramic views that justify every pedal stroke. A climb for riders who enjoy a slow reveal, where patience is tested and endurance rewarded.
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
16.0%
Where to find it
23.50–24.00 km from start
- Net height gained
- 80 m
- Section length
- 500 m
03 / The numbers
Climb statistics
- Distance
- 25.69 km
- Elevation gain
- 1,476 m
- Average gradient
- 5.6%
- Climb category
- HC
- Start elevation
- 384 m
- Summit elevation
- 1,829 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
1 h 51 min
- Power throughout
- 225 W
- Average speed
- 13.9 km/h
Based on the 25.69 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
Cuitu Negru
Lena, Asturias, Spain
- Route length
- 25.69 km
- Total ascent
- 1,476 m
- Average gradient
- 5.6%
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
Puerto de la Cubilla
27.9 km · 4.7% · 1316 m gain
Campomanes, Principado de Asturias, Spain
0.1 km away · Explore climb →
Alto Les Praeres
3.8 km · 12.8% · 535 m gain
Nava, Principality of Asturias, Spain
36.6 km away · Explore climb →
Puerto de Panderruedas
9.4 km · 5.6% · 560 m gain
Posada De Valdeón, CL, Spain
72.9 km away · Explore climb →
Jito de Escarandi
14.5 km · 7.1% · 1077 m gain
Principado de Asturias, Spain
81.8 km away · Explore climb →
Alto Campoo
15.8 km · 6.1% · 959 m gain
Entrambasaguas, Cantabria, Spain
125.3 km away · Explore climb →