More bicycles than cars have been sold in the United States over the past 12 months, with rising gas prices prompting commuters to opt for two wheels instead of four.

Not since the oil crisis of 1973 have bicycles sold in such big numbers, according to Tim Blumenthal, executive director of Bikes Belong, an industry association.

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ADDENDUM: The article also notes another factor driving bike sales:

The superstar status of cycling champion Lance Armstrong, who has won the Tour de France seven times, has also helped spark interest in the sport.