Paso Los Libbertadores Bike Climb - PJAMM Cycling

29 mi
8,481 ft
5.4 %


Page Contributor(s): Ard Oostra, Switzerland


Well, the paved switchback section is great but the unpaved switchbacks between 3200 and 3800 m altitude are even more amazing, and steeper! The dirt road is not meant for thru traffic (which takes the tunnel). But it still is an official pass. On the summit, which is the border, you find military units of both Chilean and Argentinean army, a simple bar-restaurant and a souvenir shop.

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Ascension of Cristo Redentor de Los Andes

 (3825m), Chile, Thursday 23-02-2017

Submitted to BIG Cycling by Ard Oostra (published here with his permission)

Among the greatest hairpins in the world

Around noon, with a bright sun and temperature of about 27 Celsius, we began our climb from the village of Rio Blanco (1400m altitude). Our goal is to take Road 60 to the tourist station of Portillo (2800m) then on to the Tunnel Cristo Redentor at 3185m. Depending on the situation, I have this little idea in my mind: Just before the tunnel there must be 8 km long dirt road that winds up to the Cristo Redentor de Los Andes Pass at 3825m altitude.

Of course it is possible to start the climb from a lower altitude, for example at the village of El Huape (900m alt.), which is just east of the city of Los Andes. From El Huape the road climbs gradually, apart from a short downhill, for about 30 km to 1400m altitude.

Since Road 60 is a major artery between Argentina and Chile there is significant traffic, especially trucks in transit. During the first segment, we also contend with the city traffic of Los Andes.

Once past Rio Blanco, about 5kms before the tollgate, the road widens and traffic decreases. Today we are fortunate as road marking work is being performed and traffic is regularly interrupted for up to 30 minutes which is ideal for cyclists permitted to pass through without delay. Generally, we are unimpeded by traffic as the trucks drive uphill at slow speed giving wide berth to cyclists. Further up the climb there is a series of galleries where the road is narrower, especially some kilometres before Portillo and shortly before the Tunnel Redentor.


Cyclists can bypass this last one by taking a northern parallel road. The Tunnel Redentor itself, which leads into Argentina, is prohibited for cyclists.

For the first 16 km after Rio Blanco the road is a nearly straight climb along the Rio Juncal River to 2200m altitude. The mountains surrounding us are impressive and the climate dry. The western valley wind gives us a tail wind at times.

After this start, things become more interesting, the heart of the cyclo climber goes faster and this not only because of the physical effort. In front of us rises a 400m high wall of steep and barren mountain rock, a backdrop to some of the most spectacular hairpins in the world.   The road is wide and the grade mild. Most trucks do not exceed 30km/h. The higher we climb the more breathtaking the view of the extraordinary  hairpins below us.

It is on this section that we receive most encouragements from the motorists passing by. There are few cyclists riding this road. Today we’ll meet only one other crazy cyclist: a Japanese who descends from Argentina on his fully loaded MTB. [photo?]

Arriving at the top of the “wall” a photo stop is mandatory!! This is one of the most spectacular views of a roadway we will ever experience (this rivals Stelvio)  This is where most stop, but all should continue – the next _____ kilometres are an adventure of epic proportions!!!

After the hairpins, the road climbs further, some scenic views as well (Photo 2), to the intersection leading to Portillo Ski Station (2800m alt.). No stopping for us as we have some 3 km remaining until the customs office (in the Andes, the customs-check points often are situated miles before the real geographical country border). Some road repair is being done  where the road is in bad condition (as a prelude of what is still to come). Again, we have this magnificent panoramic view of volcanic  shaped mountains, the Portillo Lake and our valley starting point now far below (Photo 3 and 4).


We are fortunate on our way up the mountain to pass customs uneventfully (not so lucky on the way down when we were delayed in spite of  never having put our wheels or feet in Argentina). This said, the frequency of control of tourists on the Andean passes seems variable and depends on the location and mood of the official on duty.

We’ve arrived at an altitude where one can feel the reduced oxygen level and it is important to pace ourselves so as to acclimate as much as possible on our long climb. The one advantage of the altitude is that it is cooler, some 15 Celsius (and we go faster in the thin air?? ). We also get the benefit of clouds forming overhead which offer welcome shade.

After passing customs we continue straight to the last gallery that we bypass. The roadway surface to this point is paved and in generally good condition except for the last kilometres. Vigilance is necessary, especially in the downhill because of irregular concrete slabs and holes.

After the last gallery a couple of hundreds of meters are left to reach the entrance of the Cristo Redentor Tunnel. We stop for a photo with the 3185m altitude road sign.

Since I have the time, energy and motivation left I decide to see if my road bike allows me to make my way up on the road old dirt road that leads to the Pass. Beware, the access to this dirt road is not marked or designated and not obvious(the start is situated about 200m before the tunnel on the south side of the main road).

After some hesitation I locate this amazing dirt road that winds up to the sky (Photo 5 to 7).


 With about 600m of altitude gain in 8 km on dirt, I am anticipating quite a challenge, compounded by the inadequate rental bike I am riding [1]and the effects of the high altitude.. But the 25mm tires show their best side and the motivation is there . . . where there is a will . . . well . . . – we shall see! Regardless, ascending to 3,000+ meters here is a good test for my future plan to ascend Atacama, the highest paved pass in the Americas at 4,800m.

Overall, the dirt road would be manageable with a road bike if equipped with wider tires. But there are some parts, often in the steep bends where there is loose gravel and stones, where the rear wheel may slip and its difficult to keep our balance. A couple of times I am forced to dismount and briefly walk.

Surprisingly, I meet in the first kilometres a group of bikers (All terrain motorbikes, with Malaysian license plates!) of which some are unable to keep their bikes up in the narrow and steep curves. I passed the motorbikes (a first!) and later see them abandoning their effort to ascend this segment.However, a few cars, pickups and SUV did pass me on the way up.

Evidently, the higher the altitude, the faster the respiration. The climb is extremely taxing and the hairpins seem to go on for an eternity, but the sense of accomplishment upon sumitting makes it all worthwhile.

The pass is on the border of Chile and Argentina and from here we have exceptional views (north/northeast to Argentina and south/southeast back to Chile). Of the majestic Andes and the tip of Aconcagua,the highest mountain. The volcanic rocks vary in color from yellow to red and from grey to black, accented by almost vertical glaciers on the highest slopes, here and there with some splashes of green in an overall dry and barren landscape (Photos 8 to 11).

The pass is on the border of the two countries and there are some military buildings, a restaurant and a gift shop at the summit. At this hour in the end of the afternoon there are few visitors and in the distance some dark clouds are developing. A kind Chilean couple that passed with their pick up during the dirt climb offered me a lift which I politely [reluctantly??] declined. I did gratefully accept their offer of water and to photograph me at the summit, thus memorializing this magnificent climbing adventure.

As it is getting late, I briefly enjoy the magnificent summit view and do note that the road on the Argentinian side of the pass seems paved and in excellent shape, my route will take me back down the steep dirt old road and prayers that I do not puncture my tire(s) at this late hour and with bad weather approaching.

The descent is not fast on my rental bike but is blessedly uneventful, other than more of the wonderful views that I experienced many hours before on my ascent. . Some photo stops.

As I descent, the sky becomes black and lightning and thunder begin. The wind picks up and the temperature drops significantly and I begin for the first time (I think anyway) to experience some altitude sickness with the onset of headache and neck pain.

Over 50 hairpins in 8.5km (Stelvio has 48 in 17km)

After what seems (or really was) an eternity, I reach the paved roadway and descend to the customs office where I have a (welcome) delay.  It has begun to rain by now and I observe a beautiful rainbow highlighted against a black sky on the side of the mountain pass. As I finish my business at customs, the rain stops and I descend Just like if the rain had stopped at the customs. Now only the last section of downhill is left in the direction of a nice sunset.

Ard Oostra

[1] Note - the Argentinian side of the pass is better because there is no tunnel to bypass – that side is paved to the top.