approximated in production models, often but not always in connection with homologation. The sport bike classes in common usage are: Lightweight, also called entry level, small or beginner bikes. Some two strokes in this class have dramatically higher performance than the four strokes, being likened to miniature superbikes. Sport bikes with engine displacements of up to about are usually in this class. Middleweight, mid-sized, mid-level, or supersport. Some of the models in this range qualify for racing in the classes AMA Supersport Championship, British Supersport Championship and the Supersport World Championship, but many middleweights do not have a significant presence in racing. Displacements of are typical. Superbike, liter-class, or literbike, i.e. or higher. As with supersport, many of the models in this class compete in superbike racing. Open class, hypersport or hyperbike, are terms sometimes used in lieu of superbike as a catch-all for everything larger than middleweight. Alternatively, these terms mark a class above the superbikes for the largest displacement sport bikes with the highest top speeds, with weights somewhat greater than the superbike class. Hyperbike was in use by 1979. The terms supersport and superbike are sometimes applied indiscriminately to all high-performance motorcycles. Categorization by engine displacement alone is a crude measure, particularly when comparing engines with different numbers of cylinders like inline or V fours with parallel and V twins, not to mention the greater power for a given displacement of two-stroke engines over four strokes. In the less developed world, smaller engine sizes are the norm, and relative terms like small, mid-sized and large displacement can have different meanings. For example, in India in 2002 there were about 37 million two-wheelers, but as of 2008, there were only about 3,000 motorcycles, or fewer than one in 12,000, of displacement or more. Similarly, the perception of relative sizes has shifted over time in developed countries, from smaller to larger displacements. When the original superbike, the Honda CB750, appeared in 1969, it was called a "big four," while today an inline four of would be classed in the middle range. Besides having product lines that span from entry level through high end sport bikes, many manufacturers add depth to that line by having pairs, or several pairs, of similar sport bikes aimed at riders of different levels. These are designed to appeal to riders seeking more or less extreme performance features. The more expensive model will be in