Bola del Mundo (Los Asientos) Bike Climb - PJAMM Cycling

8.7
FIETS
8 mi
DISTANCE
3,244 ft
GAINED
7.7 %
AVG. GRADE

FULL CLIMB STATS

Page Contributor(s): Jose Jiminez, Madrid; Jerry Root, Utah

INTRO

Notes from Jerry Root, Utah: 
 It is imperative to know that the last 5 or so kilometers of this climb are on a very difficult surface. As the grid shows, this section is challengingly steep, but the real difficulty is that the surface is crumbling cement with quite a few small breaks and a few bigger potholes. It is one of the hardest climbs I've ever done because of that surface.
(Read more in the Roadway & Parking tab below)

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It is also worth noting that the map suggests leaving from Collado Villalba on the M601. That road has a decent but small striped off area for the bike, but cars go fast and there are way too many on weekends (not advised) and even in the week. A much more peaceful option is to ride from Guadarrama up the M614 (lovely and much less traveled). You will intersect the M601 at a roundabout with very clear markings for up (Navacerrada) and down (Collado Villalba). Stopping at the pass (Puerto de Navacerrada) is already a good ride it you don't want to add the climb up to the Bola del Mundo. If you do want to do it, enter the parking lot of the ski area and take a hard right, then a quick left up a very rocky road toward a gate. You have to go through the gate (it is open) to begin the gnarly section to the top.
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MEMBER RATING

Difficulty: Strenuous
4
Road
4
Traffic
4
Scenery

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Mar 18, 2021
difficulty: Strenuous
scenery: 4
traffic: 4
road: 4
Mar 18, 2021
scenery: 4
traffic: 4
road: 4
I actually climbed it (in 2012) from the Puerto de los Cotos, but sort of crossed the CL-601 before that, as I was riding through the woods (from the Puerto de la Fuenfria) with a mountain bike... a very pleasant ride! Anyway, the most remarkable part here is the very steep finale between the Puerto de Navacerrada and the Bola del Mundo, on grooved concrete: once there, you won't be bothered by any trafic anymore (this final part is closed to cars), and you'll be able to enjoy a wonderful (and well-deserved) view at the top, close to the antennas, whose colours reminded me of Tintin's rocket... 😉
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CLIMB SUMMARY