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The hardest cycling climbs in California. From this page you may navigate to the top 10 most difficult bicycling climbs in CA. The bike climbs we have documented are in the slideshow above. Scroll down the page to access The full Top 10 California Bike Climbs "Table" below. The hardest, most difficult and challenging cycling climbs in California are, in order of difficulty, 1. Onion Valley Rd, 2. Horseshoe Meadows Rd, 3. White Mountain, 4. Sherman Pass West, 5. Whitney Portal, 6. Hwy 39-Dawson Saddle, 7. Nate Harrison Grade, 8. Mineral King Road, 9. Whittaker Forest, and 10. South Lake.