Advocating for Trails and Mountain Biking in San Diego Since 1994

Over 1100 members have stepped up to help SDMBA make mountain biking better for everyone in San Diego County. SDMBA advocacy volunteers provide a unified voice for trail users in public land use policies favoring sustainable outdoor recreational opportunities. Liaisons, trail builders, and other advocates seek out and build harmonious unified alliances and partnerships with businesses, land managers, and communities. Specialized volunteer-run programs support this mission and further inspire youth to explore and learn about nature and become its future stewards.

Events Feed


#OptOutside Family Ride at Otay Valley Regional Park

In celebration of REI's #Optoutside day, join us for a FREE family friendly short 8 mile ride around Otay Valley Regional Park. 


Ride with A Ranger #3

Mountain Bike Ride with a MTRP Park Ranger and SDMBA volunteers! 
This is the last ride in a series of 3 geared for intermediate riders. Arrive around 8:30 a.m. and hav...


Noble Canyon Trail Work

Trail Work on Noble Canyon Trail Sunday 12/3/2017 Join SDMBA as we continue our trail maintenance on upper Noble Canyon Trail cutting back the brush.

News Feed

Make someone smile this holiday! Donate your old bikes to the Community Resource Center with the help of ZOIC!

November 13, 2017

To really get you in the holiday mood, how about donating an old bike to give someone a smile! Bring your old bikes, trikes, and scooters to donate a...

Summary: 2017 Trails Stewardship Summit

November 8, 2017

Trail advocates, volunteers and professional gather in San Diego.

La Mesa Park could have some bike park Features - Fill out this Survey

October 24, 2017

Fill out this survey to tell the Mac Arthur Park Planners that you want bike features in this La Mesa Park.Fill out this quick survey and tell the par...