These days filling up at the pump means pain in the pocketbook for Americans, but the rising cost of gas is proving to be a cash cow for some. Scooter and bicycle shops are enjoying a spike in sales as more commuters turn to these two-wheeled alternatives that can get up to 110 miles per gallon. Our Jean Lee has more: Every Monday through Friday Adam White pedals his way around New York City taking his son to school before crossing the Brooklyn Bridge to his law office in lower Manhattan. "I put my son, or he climbs up onto the back of my bicycle, gets into his own seat, I get into my seat, and I ride him to school. And then from there after dropping him off I get back on my bicycle and I proceed to work."And he says he sees the roads getting more crowded these days with other bicyclists. "The last few years, I think there has been a bit of an explosion of bicycle riders of all ages." With the high cost of gas making commuting more expensive, a growing number of people from Portland, Oregon to San Francisco and New York are turning to other options. Some, with 2 wheels instead of 4. [Paul White, Executive Director, Transportation Alternatives:] "Our colleagues in Chicago, Los Angeles, Austin, Texas, everywhere really, are reporting the same thing: that thanks to investments in bike lanes and other bike infrastructure over the past several years it's now much easier for people to make the switch to bicycling."Here on Manhattan's west side this 17 mile long bike path is just one example of how some cities are making it easier for riders. And those riders are wheeling in and out of bike stores, pushing last years bike sales figures close to the record of 15 billion bikes sold during the mid 1970s when oil prices soared during the midst of the Middle East oil embargo.[Eric Schofield, Manager, Bicycle Habitat:] "We're up about 30% this year which puts us about 45% over 2 years ago."And bikes designed with city commuters in mind are proving to be popular in part because of their portability. "What are some of the popular bikes that people are coming in for these days?"[Schofield:] "We're having tremendous luck with some of the urban series; Trek has a new line out, Marin's been doing this for several years. Folding bikes are way ahead of where they were."...Two wheeling to work has its bumps. Older cities are often full of narrow streets, creating dangerous conditions for bikes and mopeds. But some groups argue there is safety in numbers.[Paul White, Transportation Alternatives:] "As our numbers go up, as there are more bicyclists, it actually gets safer to ride a bike. The more bicyclists there are, the more motorists become accustomed to seeing them and everyone gets used to sharing the road."And despite the potential road hazards, riders say pedaling or coasting to work still beats the 4 wheel alternative.[Adam White:] "It's a great stress reliever, I get to work much fresher and in a better state of mind and whatever stresses I've dealt with during the day dissipate on the ride back home." Jean Lee, Marketwatch Weekend, New York.Scooter and bike shops aren't the only ones seeing a pick-up in business. Motorcycle sales are also revving up and women are among the fastest growing demographic to buy them.