While Alexuny prepares us an explanation of what is a sport bike will start a small summary of what were sports bikes before they coined that term. For many years a sport bike was a bike that was jettisoned him unnecessary components for rolling circuit, This hobble, preparations could be very Pilgrim. The other problem was that races were made along the street, with few security measures and sometimes disastrous consequences.
The cylinder capacity nor allowed us to classify the bikes, since a 1000 cc could be used for family trips or for exploring the precarious roads of the time. Also in the Championship of the world, the largest bike racing was a 500cc.
A clear example of this period is the Vincent Black Shadow C series, a snowmobile 1000 cc which in 1954 already described what would be the modern chassis, in which a few tubes were responsible for withstand all mechanical stress of the bike. By misfortune its 55 HP era engine too for the technology of the time and their 201 km/h too many for the highways of postwar.
At the other end is the DKW 125 RT, a motorcycle for competition in the world of speed who ended up on the street to propel the prior to the World War II Germany. Its 125 cc enabled him to reach the 76 km/h, but what made her famous is that After the war was the most copied motorcycle of the world, Since BSA, Harley Davidson, the Sovietica Moska and even Yamaha produced it. In this way a bike for high competition was nothing a mere utilitarian.
It took a few years to make brands such as Triumph put the knowledge acquired with the models used in the tests of Boneville that led in its Street bikes in the Triumph Bonneville T120. This bike was clearly aimed at the younger market in United States, with a displacement of 650 cc and 46 HP can speak when referring to it in the first sport bike in history. Its production time until 1973, when in Japan brands were already beginning to apply the knowledge acquired in the racing world in the street bikes.
The first Yamaha RD 350 and the Kawasaki Mach III they used two-stroke engines with power never before seen in the street. We are talking about engines with 350 cc and 500 cc respectively giving powers of 40 CV for Yamaha (which means that a liter engine would have given 114 HP) while the Kawasaki with yielded 60 HP (120 HP per liter) The main problem of these bikes was its chassis, suspensions and brakes, too flimsy all these benefits, what turned them into very complicated driving motorcycle. To change your drivers afforded sensations close to which could be seen in Grand Prix of the season.
Another Japanese brand, Honda continued problems in four-stroke engines, and faithful to its decision in 1973 presented the Honda CB 750 Four, a bike that unknowingly put the seed of the current Superbikes. In spite of that its mechanics was nothing revolutionary, easy handling served for preparers were set on it and began to produce motorcycle intended for competition. For the first time a design for the street was so good that ended up competing in circuits.
See complete gallery» history of sports bikes, first generation (6 photos)
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