• IMBA (International Mountain Bicycling Association)
• Bay Area Ridge Trail
• California State Parks
• California State Parks Foundation
• Marin County Bicycle Coalition
• Bikes Belong
• Dirt Rag Magazine Access Column
• NorCal High School Mt. Bike Racing League
• ROMP (Responsible Organized Mountain Pedalers)
• Trips For Kids

Other User Groups

• Bay Area Barns and Trails
• Marin Horse Council
• Bay Area Trails Preservation Council
• Tamalpais Conservation Club
• Marin Conservation League
• Trails Forever
• Sierra Club Marin
• Audubon Canyon Ranch
• California Alpine Club
• Headlands Institute
• Marin Agricultural Land Trust
• Marin Conservation Corps

Great Bike Resources

• MTBR.com
• Bike Magazine
• Dirt Rag Magazine
• Twenty Nine Inches
• Cycling News
• Mountain Bike Hall of Fame
• Fixed Gear Gallery
• Velo News

Marin Bike Stores

• Sunshine Bicycles
• Paradigm Cycles
• Summit Bicycles
• Fairfax Cyclery
• Breaking Away Bicycles
• Caesar's Cyclery
• Bike RX
• Village Peddler
• Mill Valley Cycleworks
• A Bicycle Odyssey
• Mikes Bikes
• 3 Ring Cycles
• Black Mountain Cycles
• ClassCycle
• Re-Cyclery
• REI
• Performance

• Marin County Open Space
• China Camp
• Mt. Tamalpais State Park
• MMWD
• Point Reyes
• Marin Headlands
• Friends of Tamarancho

Bike events

• Fairfax Fat Tire Festival
• Mountain Bike Film Festival
• MCBC's Big Bike Bash
• Sea Otter
• Carrera de San Rafael

Sponsors

• Clif Bar
• Specialized
• Axion Design (Share the Trail logo and design work)
• Sunshine Bicycles
• Wilderness Trail Bikes

Small Frame Builders

• Ventana
• Vanilla Bicycles
• Calfee
• Sycip
• Soulcraft
• Kish
• Hunter
• Inglis/Retrotec
• Niner
• Turner
• Ellsworth
• Castellano
• Wolfhound
• Pereira
• Steve Potts
• Rock Lobster
• Strong Frames
• Steelman