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Critical Mass
San Francisco, California
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where ever the group of riders at the front decide to go. critical mass usually draws 100 to a thousand participants. you will see bikes of all different kinds at critical mass, to full on downhill bikes to a schwinn crusier with full fenders all done up in cowhide--with a man in a cowboy suit riding it.  http://trails.mtbr.com/cat/united-states-trails/california-trails/californi...
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