I just moved to Southern California about 5 mos. ago from Minnesota and had no idea mountain biking actually included mountains.
Mountain biking, road biking, and motorcycling is a passion of my boyfriends so we ended up upgrading my 15 year old Bianchi with a Salsa AND a Flek.
It's been great to ride all year around. Unfortunately and ironically, there aren't as many trails here than in MN where the season is maybe 4-5 months long.
Anyway, for now I'm just looking for trails in the OC areas for both on and off road.