Trek Bicycle Superstore - Bicycle products, racing news, and classes. Locations in La Mesa and San Diego. - http://treksandiego.com/
Mountain Bike Warehouse - Bicycles, frames, parts, accessories, clothing. Stores in San Diego and San Marcos, also online shopping. Site includes list of local bike rides, with maps and descriptions, plus calendar of local group rides. - http://www.mountainbikewarehouse.com/