Top 10 bike climbs in California with the greatest elevation gain. We have documented most of the 10 California Bike climbs with the most elevation gained and those are featured in the slideshow on this page as well as the Table for the full Top 10 California Bike Climbs. The cycling climbs gaining the most altitude in California, and some of the hardest and most scenic California bicycling climbs are, in order of elevation gain, 1. Mineral King Road, 2. Hwy 21-245-180-198, 3. Hwy 33 to Pine Mountain Summit, 4. Onyx Summit, 5. Whitaker Forest, 6. Horseshoe Meadows Rd, 7. Glendora Mountain Road, 8. Hwy 39 - Dawson Saddle, 9. White Mountain, and 10. Mt. Baldy from Hwy 39