The Enterprise of Brockton, Mass. www.enterprisenews.com By Peter Cox ENTERPRISE STAFF WRITER The Bike Barn in Whitman has seen a serious spike in business recently as people driven by high gas prices come in to fix up old mountain bikes they've neglected over the years. Owner Kevin Chichlowski said commuters are scrambling to find a cheaper way to get to work as gas hovers around $4 a gallon. "What's fashionable right now is to ride a bike to the commuter rail (station)," he said. "Anyone with an old mountain bike is getting it cleaned up and ready for the road." The dollar drain for motorists has translated into a windfall for bicycle shops as gas prices force more commuters out of their cars and onto two-wheelers. Many local bicycle shop owners say they've had their busiest spring in history. People are dusting off their 20-year-old Schwinns and Raleighs, generating increased tune-up work. And sales of new bikes are inching up, with many buyers choosing hybrids that combine...