SANTA ANA, Calif. — Bicycle parts crowd out all but the washer and dryer and Christmas ornaments packed on a few shelves in Randy Kiefer’s garage.Overhead, dozens of tires and tire tubes — tied together in bunches by size, 26- and 27-inch — hang like long, skinny pieces of black rubbery fruit. Bicycle forks straddle a narrow beam. Frames are tucked up in the rafters; rims hooked to the walls.