Most Challenging Major Climbs in Cycling History

Notorious for its steepness, once deemed too hard for racing.

One of the highest paved roads in the Alps, known for its challenging ascent.

Iconic climb known for its challenging conditions and steep sections.

Famous for its cobblestone surface and steep gradients up to 22%.

Features steep ramps up to 24% in the final kilometers.

One of the most historic climbs in the Tour de France, known for its length and gradient.

Known for its maximum gradient of 23.5% and an average of 9.8% over 12.5 km.

Considered one of the toughest climbs in Italy, with a relentless ascent.

Features 21 hairpin turns with a maximum gradient of 13%.

Features an average gradient of 11.5% over 10.5 km, with sections reaching over 15%.