the growing number of cyclists interested in road racing or touring. Instead, most Schwinn derailleur bikes were marketed to the general leisure market, equipped with heavy "old timer" accessories such as kickstands that cycling aficionados had long since abandoned. More and more cyclists, especially younger buyers, began to insist on stronger steel alloys (which allowed for lighter frames), responsive frame geometry, aluminum components, advanced derailleur shifting, and multiple gears. When they failed to find what they wanted at Schwinn, they went elsewhere. While the Paramount still sold in limited numbers to this market, the model's customer base began to age, changing from primarily bike racers to older, wealthier riders looking for the ultimate bicycle. Schwinn sold an impressive 1.5 million bicycles in 1974, but would pay the price for failing to keep up with new developments in bicycle technology and buying trends. With their aging product line, Schwinn failed to dominate the huge sport bike boom of 1971–1975, which saw millions of 10-speed bicycles sold to new cyclists. Schwinn did allow some dealers to sell imported road racing bikes, and by 1973 was using the Schwinn name on the Le Tour, a Japanese-made low-cost sport/touring 10-speed bicycle. Schwinn developed strong trading relationships with two Japanese bicycle manufacturers in particular, Bridgestone and National/Panasonic. Though these met initial dealer resistance as "imports" and were not included in the Schwinn consumer catalog, it was soon realized that the Panasonic and Bridgestone 'Schwinn' bicycles were fully the equal of the American-made versions in quality and performance. Schwinn soon had a range of low, mid- and upper-level bicycles all imported from Japan. Schwinn's standard road bike model from Panasonic was the World Traveler, which had a high-quality lugged steel frame and Shimano components. Schwinn also marketed a top-shelf touring model from Panasonic, the World Voyager, lugged with butted Tange chrome-molybdenum alloy tubing, Shimano derailleurs, and SunTour bar-end shifters, a serious challenge to the Paramount series at half the price. By 1975, bicycle customers interested in medium-priced road and touring bicycles had largely gravitated towards Japanese or European brands. Unlike Schwinn, many of these brands were perennial participants in professional bicycle racing, and their production road bicycles at least possessed the cachet and visual lineage of their racing heritage, if not always their componentry. One example was Peugeot, which won several Tour de France victories using race bikes with frames occasionally constructed by small race-oriented framebuilders