Title: Minibike
Content:  A minibike is a two wheeled, off-highway recreational vehicle popularized in the 1960s and 1970s, but available continuously from a wide variety of manufacturers since 1959. Traditionally, minibikes have a four-stroke, horizontal crankshaft engine, single- or two-speed centrifugal clutch transmissions with chain final-drive, 4" or 6" wheels and a low frame/seat height with elevated handlebars. Commercially available minibikes are usually equipped with engines commonly found elsewhere on utilitarian equipment.
Title: Pocketbike
Content:  of MiniMoto racing, Pocketbikes have been informally and inaccurately referred to as Minibikes. While the machines share certain attributes, Pocketbikes are more akin to sport bikes than minibikes, and are wholly their own machine by construct. The differences include frame manufacture and material, fairings, controls, engine placement and overall design. The misconception is likely due to two factors; The introduction of Pocketbikes into North America as inexpensive models not recognized for there intended competitive purpose, and being seen as toys rather than unique vehicles. The rapidness of law changes in the mid-2000s to remove previously undefined and unregulated Pocketbikes from public through-ways 
Title: Minibike
Content:  In some jurisdictions, it is not legal to operate minibikes in certain places or without regulatory-specified special equipment. While US laws vary by state, Minibikes became unlawful for use on public through-ways due to lack of safety equipment, lights, and their diminutive size causing visibility issues. In 1977, the CPSC was unsuccessfully lobbied to add federal regulation to Minibikes. By 1979 in the US, Minibikes could not be operated on public roads, they could still operate in areas legal for use of other recreational vehicles, provided they had a specified set of proper equipment utilized at the time of sale, most notably a spark arrestor for the exhaust. In many US states mini bikes can be made street legal. In Canada, Minibikes do not meet Federal safety standards for use on public roads. In the UK, it is not legal for Minibikes to be used on public roads or land. Further, it is not legal to use Minibikes on a property in proximity to a population if cited for noise pollution.
Title: Mini sprint
Content:   A mini sprint is an American type of open-wheel racing vehicle. Mini sprint cars resemble the shape of a full-size sprint car and the size of a midget car. Although often used liberally to describe several different types of motorcycle-powered open-wheel racing cars, the term mini sprint actually applies to cars that have an upright-style chassis (the driver sits upright in the seat as in a sprint or midget), a center-mounted 4-cylinder motorcycle engine with a displacement between 750 to 1200cc, and dimensions and appearance that are similar to today’s midget. Mini sprints are chain driven and use 13 in wheels and tires.
Title: Minibike
Content:  models, including Arctic Cat, Rupp, Taco, Heath, Gilson, and Fox. Traditional motorcycle manufacturers also released models inspired by aspects of minibikes, most famously Honda with the Z50A, though this style was affectionately known as a Monkey Bike, a slang-term due to its street-legal demographic requiring a seminarian riding position. Sales peaked in the 1973, with 140,000 units between manufacturers. By 1976 the bubble had burst and less than ten manufactures continued to make minibikes. Popularity declined steadily, but leveled off in the early 1990s. Currently, machines can still be found at various retailers for less than $600. Recently there has been a trend of adult sized electric minibikes produced by up and coming electric bicycle brands.
Title: Outline of motorcycles and motorcycling
Content:  single cylinder, light weight bike fitted with equipment better suited to street riding or racing such as 18 inch front wheel and road tyres ; Off-road motorcycle ; Motocross motorcycle ; Track racing motorcycle – customised for track racing, with no brakes and fueled with methanol ; Trials motorcycle – an extremely lightweight design, that lacks seating (designed to be ridden standing up) and that has suspension travel that is short, relative to a motocross or enduro motorcycle Small class ; Minibike – sometimes called a mini-moto or pocket-bike, it is a considerably smaller motorcycle; most traditional minibikes use a two stroke engine 
Title: Vyrus
Content:  The MiniVirus was a pocketbike powered by a two-stroke 40cc engine and again using the hub-centre front steering system. Like the full-size bikes, the MiniVirus was expensive, costing over $5,000USD. Few were made.
Title: YikeBike
Content:  The YikeBike mini-farthing is a type of folding electric motorbike released on 2 September 2009 at Eurobike, going into production mid 2010. It weighs 11.2 kg and when folded, it is small enough to fit in a carry bag, so it can be transported in an urban bus. The YikeBike was invented by Grant Ryan and designed by a team in New Zealand over 5 years.
Title: Pocketbike
Content:  Pocketbike racing, known as MiniMoto, is a professional, internationally sectioned sport. It is raced by both youth and adults, on specialized, high performance machines. Several notable MotoGP racers and champions first raced in MiniMoto, including Valentino Rossi, Loris Capirossi, Nobuatsu Aoki, and Daijiro Kato. The sport of Minimoto originated in Japan in the 1960s, expanding as a professional sport in the 1970s, before spreading to Italy in the 1980s and most of Europe in the 1990s. Since the introduction of Pocketbikes as a recreational vehicle in North America in the early 2000s, various events have been organized, but there has been no long standing governing body for a series. In 2006, PocketBike Racer, a video game for Xbox 360, was released exclusively through Burger King, as part of a promotional campaign.
Title: Mini (marque)
Content:  Mini (stylised as MINI) is a British automotive marque founded in 1969, owned by German automotive company BMW since 2000, and used by them for a range of small cars. The word Mini has been used in car model names since 1959, and in 1969 it became a marque in its own right when the name "Mini" replaced the separate "Austin Mini" and "Morris Mini" car model names. BMW acquired the marque in 1994 when it bought Rover Group (formerly British Leyland), which owned Mini, among other brands. The original Mini was a line of British small cars manufactured by the British Motor Corporation (BMC), which in 1966 became part of British Motor Holdings. This merged with 

Question: what makes a mini bike a mini bike?
Answer: a miniature motorcycle.