Rising gas prices are giving the bicycle business a big boost. For the first time since the oil crisis in 1973, more and more people are choosing to ride two wheels instead of four. The sharp rise in the price of gasoline is being credited for generating almost six billion dollars in bicycle sales in the United States over the past 12 months. The manager of one Greenville bicycle shop says he's not surprised by the new trend. Another benefit of riding a bike? It helps burns all those extra calories very quickly.