4sq SUs Belgium: First held in 1892, LBL is the oldest of all cycling classics. Steep hills such as Côte de Saint-Nicolas, La Roche aux Faucons and the iconic La Redoute make La Doyenne one of the toughest too.
4sq SUs Belgium: 2300 m climb, 227 altimeters, average gradient 10%, maximum gradient 21 %. Probably the toughest of all climbs in the cycling classic Liège-Bastogne-Liège.