In our area:
Mere Mortals Mountain Biking – ‘Our fast is everyone else’s slow.’ IMBA Affiliate
San Jose Mountain Biking Meetup
Silicon Valley Bicycle Coalition (SVBC) – Silicon Valley area bicycle advocacy group.
Regionally:
Access4Bikes – Marin – North Bay mountain biking advocacy group and IMBA affiliate.
Bicycle Trails Council of the East Bay (BTCEB) – East Bay mountain biking advocacy group and IMBA affiliate.
Folsom Auburn Trail Riders Action Coalition (FATRAC) – Folsom-Auburn area mountain biking advocacy group and IMBA affiliate.
International Mountain Biking Association (IMBA) – International mountain biking advocacy organization. ROMP is an affiliate group
Monterey Off Road Cycling Association – (MORCA)Monterey area mountain biking advocacy group and IMBA affiliate.
Mountain Bikers of Santa Cruz (MBoSC) – Santa Cruz area mountain biking advocacy group and IMBA affiliate.
Sonoma County Trails Council (SCTC) – Sonoma County trails advocacy group.
Tahoe Area Mountain Bicycling Association (TAMBA) – Lake Tahoe area mountain biking advocacy organization.
Turning Wheels For Kids – A nonprofit charity dedicated to provide a new bike to every underprivileged child that has ever wanted a bicycle. TurningWheels for Kids raises money through donations all year around to purchase bicycles for children at Christmas.