Often times you will see road bike tires labeled something like; 700×25. The first number (in this case, 700) indicates the diameter of the tire in millimeters and is fairly standard in the category. The second number (25) shows the width of the actual rubber tire in millimeters and is more likely to vary across individual bikes in the category.
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Unlike its progenitors, the Klunker proved incapable of withstanding hard off-road use, and after an unsuccessful attempt to reintroduce the model as the Spitfire 5, it was dropped from production. Another problem was Schwinn’s failure to design and market its bicycles to specific, identifiable buyers, especially 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, schwinn mountain bike began to insist on stronger steel alloys (which allowed for lighter frames), responsive frame geometry, aluminum components, advanced derailleur shifting, and multiple gears.[8][30] 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.
As always, the Paramount spared no expense; the bicycles were given high-quality lightweight lugged steel frames using double-butted tubes of Reynolds 531 and fitted with quality European components including Campagnolo derailleurs, hubs, and gears. The Paramount series had limited production numbers, making vintage examples quite rare today. Other road bikes were introduced by Schwinn in the early and mid 1960s, such as the Superior, Sierra, and Super Continental, but these were only produced for a few years. The Varsity and Continental sold in large numbers through the 1960s and early 1970s, becoming Scwhinn’s leading models.
This proved to be a major miscalculation, as several new United States startup companies began producing high-quality frames designed from the ground up, and sourced from new, modern plants in Japan and Taiwan using new mass-production technologies such as TIG welding. In the 1950s, Schwinn began to aggressively cultivate bicycle retailers, persuading them to sell Schwinns as their predominant, if not exclusive brand. During this period, bicycle sales enjoyed relatively slow growth, with the bulk of sales going to youth models. In 1900, during the height of the first bicycle boom, annual United States sales by all bicycle manufacturers had briefly topped one million.