He developed his own rating method, which is similar to the method used at TourOfCalifornia.org, with additional adjustments for altitude, grade variability, and road surface.
[At 10,000 Feet]
Below is a brief summary of the top climbs. The book covers additional categories as well as many more climbs with relevant details.
Most Difficult Climbs:
1) Onion Valley
2) Horseshoe Meadows
3) White Mountain
4) Sherman Pass
5) Whitney Portal
6) Mount Baldy
7) Shirley Meadows
8) South Lake
9) Mount Palomar
10) Mosquito Flat
Greatest Elevation Gained:
1) Dawson Saddle - 6,400 feet*
2) Horseshoe Meadows - 6,234 feet
3) White Mountain - 6,204 feet
4) 190 - 6,199 feet
5) J21/245/180 - 5,750 feet
6) Mosquito Flat - 5,548 feet
7) Dantes View - 5,475 feet
8) South Lake - 5,445 feet
9) Sherman Pass - 5,316 feet
10) Emigrant Pass - 5,309 feet
Highest Elevation Attained:
1) Mosquito Flat - 10,250 feet
2) White Mountain - 10,100 feet
3) Horseshoe Meadows - 10,034 feet
4) Tioga Pass - 9,945 feet
5) South Lake - 9,835 feet
6) Sonora Pass - 9,624 feet
7) Kaiser Pass - 9,184 feet
8) Onion Valley - 9,163 feet
9) Lake Sabrina - 9,141 feet
10) Sherman Pass - 9,126 feet
See also Top Bike Climbs in the United States.