New exhibition focuses on Northern California’s role in the development and evolution of the mountain bike SAN FRANCISCO, 2012-07-23 — /travelprnews.com/ — From its humble origins as a modified, single-speed “clunker” raced downhill on the trails of Marin County in the early 1970s, to today’s sophisticated machine used for recreation, commuting, and international competitions, the mountain bike… Read the full press release