Puerto de San Lorenzo (San Martín) - Asturias
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Puerto de San Lorenzo is a climb of two halves. The first 6km are gentle and, apart from a few short stretches, are comfortable to ride. The second half, however, is a very challenging climb with an average gradient above 11%. There is very little chance to recover here so it is important to remain below threshold, and the wide, straightish road can sap morale if you are struggling.
Roads & TrafficThe road is in very good condition throughout.
There is very little traffic on this climb.
Puerto de San Lorenzo is one of the gateways to the Somiedo Natural Park. It is a scenic climb, particularly towards the top as you climb out of the forests, but it is a challenging ascentm particularly if you play on following it with La Farrapona or Puerto de Somiedo.
It has been used several times in recent editions of the Vuelta a España, but has rarely seen decisive attacks by GC contenders, as it has never been the final climb on a stage and the steep gradients often lead it to be ridden conservatively.
San Lorenzo from both sides is a very fast descent. There are few hairpin bends - particularly on the descent towards San Martín - and the steep gradients allow you to pick up speed quickly. Beware of horses and cows though that will often be standing in the middle of the road.
San Lorenzo is usually closed in winter due to snow; although at times it is cleared and is passable by bike. From April to Novemebr it is nearly always open.
Other SidesPuerto de San Lorenzo can also be climbed from the west, beginning in the village of La Riera. This side is similar in length and gradient to the eastern side.
Nearby ClimbsLa Farrapona
Puerto de Somiedo
Ermita de Alba