Mûr de Bretagne

Mûr de Bretagne climb is a focal point for cyclists in France’s most cycling-obsessed region, Brittany. It is short but tough, actually the first half of the climb is much tougher, where the gradient usually stays above 10%. The second half is much easier. The climb is 2.21 km long. Over this distance, you gain 144 meters of elevation. Thus, the average percentage is 6.5%.
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Bola del Mundo

Bola del Mundo, also known as Alto de las Guarramillas is a mountain of the Guadarrama mountain range located in the Community of Madrid in Spain, near the border with the province of Segovia. Its height is 2,257 meters (some sources give it 2.265 meters). It is one of the hardest climbs ever seen in pro cycling. Despite its modest average gradient of 6.2%, the climb gets really hard in the final kilometers where average gradient is always above 10% and at some points it gets as steep as 19%.
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Mirador de Ézaro, the steepest climb in the bicycle racing history

A hundred meters from the beach of Ézaro, where the Galician coast at its best, there is an ominous sign with a red warning triangle: thirty percent (30%) warns the board, then you directly ride against uphill over a huge rock. This is Mirador de Ézaro, the steepest climb in the bicycle racing history.
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