Notice anything about the bike riders passing you lately? More than likely they are riding a fixie (see above) a snazzy fixed gear and usually no brake bike popularized by SF bike messengers, now the bike-du-jour. The teenage boys I know are fixated on them; if you saw Saturday night's Crank Mob fly by, you probably saw hundreds. My son's came via the Internet from Bikes Direct. We're already good customers of Safety Cycle since these bikes seem to require TLC.