Superbike racing
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ja:スーパーバイク世界選手権 Superbike racing is a category of motorcycle road racing based on heavily-modified production motorcycles, approximately akin to Touring car racing.
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The motorcycles concerned are either 1000cc four-cylinder or 1000cc twin-cylinder machines (900 cc triples are permitted, but at this stage only Benelli and Foggy Petronas - both very small companies - have run them in World Superbikes Championships) and weigh approximately 160 kilograms. The frames (and engine blocks?) must be identical to the production bikes, but other components are free for extensive and expensive modification.
The category is highly popular with manufacturers. As the race bikes are built from road bikes, the marketing value of a Superbike victory is significant. There is a World Championship series and an American championship, as well as British, Canadian, and Australian series.
There is a variant of the concept called SuperSport which involves 600cc fours or 750cc twins and generally more restricted modifications.
The series' future, however, is somewhat uncertain at this point (October 2003), with the reintroduction of four-stroke motorcycles to the Grand Prix racing series and frequent rule changes.
The most accomplished Superbike racer is Carl Fogarty of England.