A Motorized bike is a bicycle with an attached motor and transmission used either to power the vehicle unassisted, or to assist with pedaling. Since it always retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized bicycle is in technical terms a true bicycle, albeit a power-assisted one. However, for purposes of government licensing and registration requirements, the type may be legally defined as a motor vehicle, motorcycle, moped, or a separate class of hybrid vehicle. Powered by a variety of engine types and designs, the motorized bicycle formed the prototype for what would later become the motorcycle

Motorized bicycles have utilized all variety of engines, from internal-combustion (IC) two-stroke and four-stroke gasoline engines to electric, diesel, or even steam propulsion. Most motorized bicycles are based or derived from standard general-purpose bicycle frame designs and technologies, although exceptions abound. In addition, modifications to a standard bicycle frame to support motorization may be extensive.

The earliest motorized bicycles were ordinary utility bicycles fitted with an add-on motor and transmission to assist normal pedal propulsion, and it is this form which principally distinguishes the motorized bicycle from a moped or motorcycle. In a day when gasoline engine and transmission designs were in their infancy, and power-to-weight ratios were low, a dual-purpose propulsion system seemed particularly advantageous. As time went on, pedal propulsion was increasingly replaced by constant use of a two or four-stroke gasoline engine. Nevertheless, the concept of using motor assist for the ordinary bicycle has persisted, and the concept has periodically resurfaced over the years, particularly in times of austerity or fuel shortages. In countries where automobiles and/or fuels are prohibitively expensive, the motorized bicycle has enjoyed continued popularity as a primary mode of transportation.[1]

The design of the motorized bicycle or motorbike varies widely according to intended use. Some motorized bicycles are powerful enough to be self-propelled, without use of the pedals. A development of the motorized bicycle is the moped, which commonly has only a vestigial pedal drive fitted primarily to satisfy legal requirements, and suitable only for starting the engine or for emergency use. The alternate design philosophy to the moped is the so-called motor-assist or pedal-assist bicycle. These machines utilize the pedals as the dominant form of propulsion, with the motor used only to give extra assistance when needed for hills or long journeys.

Why use Friction drive kits

Simplicity of construction is the greatest advantage of a friction-drive system. Installing a friction-drive motor is simple: You merely attach it to the bicycle’s frame, above the rear tire, in such a way that the motor’s drive shaft makes contact with the tire. This layout also makes it simple to remove the motor or the bike tires whenever you need to do maintenance or change a flat. Also SAFTEY frist because on our friction kit there is no belt or chain to get stuck and when that happens on chain drive bike you will go from 30-0 in a couple of seconds.

The addition of extra moving parts means that a chain drive bike is more likely to break down than a friction drive. The chain connection is also considerably more complicated to install and maintain. In addition to adding a sprocket to one of the tires for the motor to utilize, you may have to adjust the chain length to fit your bicycle and add a chain tensioner to keep the drive chain from slipping off its sprockets. Also most importantly most of the chain drive kits come from china and are very unreliable.

Links Motorized bike:
Home page—http://www.flmotorbikes.com/

Links Bicycle engines:

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Originally posted 2011-04-01 20:02:29. Republished by Blog Post Promoter