Billy';s Hill Climb takes place on the Indian Truck Trail, a single lane jeep trail from Corona California to a pass between Santiago and Trabuco Peaks in the Trabuco region of the Cleveland National Forest. The course is wide enough to allow easy passing in either direction. The footing is 97% decomposed granite and 3% exposed rock. It is without exception, the fastest dirt course on the Mountain. Although there is significant elevation changes (2,400ft), none of the grades are demanding or particularly dangerous.
See web site for details and directions to start.