Grizzly Peak Cyclists, Inc.
A Berkeley based group of folks who enjoy bicycling

ROMP (Responsible Organized Mountain Pedalers)
A group active in representing the interests of mountain bikers in the South Bay.

Gorp.com's San Francisco Bay Area Biking Guide
Gorp stands for "Good Old Raisins and Peanuts". (Trail mix.) This site is a great resource for outdoor activities.

Mountain Biking Trails in the San Francisco Bay Area
A list of links to other sites containing information and maps of bay area trails.

Roger's Favorite Singletrack Mountain Bike Rides
A site listing many places to ride, along with riding techniques.

Bay Area Mountain Biking
Mountain Bike riding, racing and training list for serious riders in the bay area.

Team Wrong Way
A mountain bike club based in the San Francisco bay area.