Underbone
The underbone motorcycle was born in Asia in 1958 when Soichiro Honda rolled out the first Honda 50.
An underbone motorcycle is a small motorcycle built around a single tube frame called the underbone. This ‘underbone’ supports the whole vehicle and runs low all across the length of the motorcycle. There is a similarity in appearance to the scooter, largely due to the fuel tank position, the open-frame design which the fuel tank position allows and the splash guards. However, the entire power train, namely the engine position, power transmission and wheels are based on the design of conventional motorcycles.
The position of the fuel tank, in fact, located below the seat, is the main aspect that truly differentiates the underbone with other conventional motorcycles. This allows for a design that improves ease of mounting and dismounting, making the underbone popular with consumers of both genders.
The engine size of a typical underbone motorcycle can range between 80cc to 150cc. In the early years, two-stroke engines were the norm, but come the turn of the millennium, the four-stroke evolution picked up speed.
The technical sophistication of larger motorcycles such as fuel injection systems, capacitor discharge ignition and electric starters, were gradually fused into the underbone. With each addition, the underbone became zippier, sportier and trendier.
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