When I rode it we went up Gridley and down Pratt. That was a couple years back so memory is not perfect, but I think that is the best way to do it. Gridley is a real nice climb - good grade and trail surface. I think Pratt would be a tougher climb. There is a bit of technical rock at the bottom of both, shorter and easier to ride up on Gridley - and longer and more fun to descend (challenging) on Pratt.
Parking at the base of Pratt and doing a loop up across Shelf Rd. up Gridley across Nordhoff Ridge and down Pratt is the way to go. Lower Pratt would be about a mile of HAB up (chunk/technical coming down) and Upper Pratt is steeper and looser than Gridley.
A longer ride that would allow you to descend Gridley is to start in Upper Ojai and ride up Sisar Canyon, across Nordhoff Ridge and down Gridley. This requires a shuttle or road miles with climbing.
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