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The longest cycling climbs in the United States. From this page you may navigate to the top 10 Longest bicycling climbs in the USA. The US longest bike climbs we have documented are featured in the slideshow below. Scroll down this page to access the US Longest 10 Bicycle Climbs "Table". The cycling climbs covering the most distance in the USA, and some of the hardest and most scenic bicycling climbs this state are, in order of distance, 1. Mauna Loa, 2. Trail Ridge, 3. Mauna Kea, 4. Haleakala, 5. Onyx Summit, 6. Beartooth Pass North, 7. Mt. Lemmon, 8. Hwy 21-245-180-198, 9. Mount Evans, and 10. Sedona .