The Fullerton Loop is an intra-urban mountain bike ride. There is no single outstanding feature of the ride. But, because it is a mountain bike ride in a suburban community and it traverses a wide variety of trails, it is an epic ride.
I have heard rumors of several side loops to the Fullerton Loop, yet I only know of the side loop around the Union Oil Fields. One rumor is of a loop that goes around/through the Los Coyotes Country Club and Ralph B. Clark Regional Park. Another rumor is of a loop that crosses the bridge over Idaho/Gilbert in the middle of the Chevron oil field. I would appreciate finding out more about these side loops.