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A scooter is a style of motorcycle with certain design characteristics such as a step-through frame, small wheels, automatic transmission and small engine. The general definition of a scooter is evolving as motorcycle designs have changed over time. Historically, a scooter was noted for a small engine, small wheels, a step-through design, a forward fairing with floorboards, and possibly under-seat storage. Modern scooters cover a broad spectrum of cycle design: step-through design or step-over design, small or large wheels, front fairings or floor boards, under-seat storage or not, and manual or automatic transmissions. Most scooters today feature automatic transmissions.

The classic scooter design features a step-through frame and a flat floorboard for the rider's feet. This design is possible because the scooter engine and drive system, transferring power to the rear wheel, is either attached to the rear axle or under the seat. In contrast to a frame mounted motorcycle engine, this front-hinged arrangement allows the engine to swing vertically in conjunction with the motion of the rear wheel. Older Vespas, most vintage scooters, and some newer retro models have axle mounted engines with a manual transmission with the gear shift and clutch controls built into the left handlebar. Most newer scooters use a Continuously Variable Transmission (CVT).

In contrast to most motorcycles, scooters generally feature bodywork, including a front leg shield and body that conceals all or most of the mechanicals. There is often some integral storage space, either under the seat, built into the front leg shield, or both. Most modern motor scooters have smaller wheels than motorcycles, between eight and 12 inches (20-28 cm) in diameter (though maxi- and big-wheel scooters may have larger wheels). Most scooters have smaller engines than motorcycles (between 30 cc and 250 cc with a single cylinder, though larger models have twin cylinder 400 to 650 cc. motors).

Scooters trace their origins to France, with the Auto-Fauteuil mark in 1902, 1903 in the United States, where Cushman and Salsbury created some of the first motorized two wheelers with the traits that have come to embody scooters. Salsbury produced the first automatic scooter with a Continuously Variable Transmission (CVT). Cushman's light, compact, and rugged scooters were used by the United States military as ground vehicles for paratroopers during World War II. The Vespa, originally manufactured by Piaggio in post-WWII Italy, quickly popularized motor scooters in places where inexpensive transportation was in dire need. Constructed using aircraft design and materials and eliminating belt drive by mounting the engine on the axle it redefined the vehicle type for 35 years. Despite Vespa's dominance of the scooter market, they were not without competition.

Lambretta offered models that rivaled those in the Vespa product line. In the 1980s new versions of scooters began to be released and become popular, especially in Japan and far-east Asia. This style of scooters began to reflect that of larger, sporty, higher-performance motorcycles of the time and the trend has continued to the current day. With the release of the Honda Ruckus, new trends towards dirt-bike scooters are just beginning. The classic styling of the Vespa has never lost its popularity, however and remains the most popular and most imitated scooter design. Almost all manufacturers now carry both a classic/retro model and a sporty/modern model.

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