North Ranch Mountain Bikers
North Ranch Mountain Bikers (NRMB) is the largest and oldest mountain bike riding group for adults in the Los Angeles area. They have rides most every Wednesday night and Saturdays and Sundays year-round on a multitude of trails. Many of their rides are on trails in The Santa Monica Mountains National Recreational Area, which spans Los Angeles and Ventura Counties; however, they also regularly ride in the San Gabriel, Santa Barbara, Frazier Park and San Bernardino Mountain areas as well.
All of their rides are recreational in nature and are not competitive. They have rides for all levels of riders; beginner to advanced, so pick rides that best fit your skill & athletic abilities. A listing of all of their current month rides is available for download on their website.