The steepest mile of the top cycling climbs in the world. From this page you may navigate to the top 10 steepest bicycling climbs in the world. The world's steepest bike climbs we have documented are featured in the slideshow below. Scroll down this page to access the world's steepest 10 Bicycle Climbs "Table". The cycling climbs covering the steepest gradient in the world, and some of the hardest and most scenic cycling climbs this state are, in order of steepness, 1. Mombacho Volcano, 2. Nebelhorn, 3. Scanuppia, 4. Pico Arieiro, 5. Jesenierstrabe , 6. Alpe Fuori, 7. Prato Maslino, 8. Cami Pic de Carroi, 9. Wuling Pass North, and 10. Passo della Forcella.