Motorized bicycles are one of the best ways to inhale some fresh air, go green and reduce air pollution. A motorized bicycle consists of a drive system that can be incorporated easily and without much difficulty onto a bicycle in a manner that enable the bicycle to pedal in a relaxed mode without increasing force required to pedal the bicycle. The motorized bicycle consists of a wheel on which a drive gear is mounted, which in turn is linked to the drive gear, and a drive device attached to the driven gear. The drive device comprise a motor designed to rotate an output shaft, a rotatable drive shaft, a first drive device connecting the output shaft to the drive shaft, and a second drive tool detachably linking the drive shaft to the driven gear. The second drive device is activated by rotation of the drive shaft by the first drive tool. The drive system is mounted on a support that is adjustable and mounted on the bicycle's structure.Early designs typically consist of chain or gear technologies which were driven by a motor and which were in permanent contact with the bicycle's drive sprocket along with the pedals. While these motorized driving technologies did supply a secondary power to a bicycle, they have their own disadvantages as well. Like, the motor and its drive system were generally in direct contact with the pedals all the times, which need the rider to drive the motor during pedaling. The use of the motor importantly enhanced the power required to pedal the bicycle. In addition, the drive technologies of these early motorized bicycles were tough to incorporate into existing bicycles as they need complicated driving facilities which required wide-spanning modifications of the bicycles onto which they were fixed. As a result, these technologies could not be used on multi-speed bicycles.If you are planning to purchase a motorized bicycle, there are many alternatives and restrictions to take care of. Find out the restrictions prevalent in your state. The laws on riding motorized bicycles vary significantly from one state to another. You can check out for an electric or gas motor. Frankly speaking, quality gas motors are more expensive and exclusive and needs to be repaired frequently but will take you faster and farther whereas electric motors are cheaper and require less maintenance but reach out shorter distances at lower speeds. You should also decide on whether to buy a kit to incorporate a motor to an existing bicycle or just buy the fully built motorized bicycles.Now where can you find such product! If you live in or close to a metropolitan city, you may find a dealer in any of the showrooms. Check with local bicycle and scooter dealers to find out if they possess what you are looking for. If you are unable to find anything in your close vicinity, do not give up. The Internet is flooded with manufacturers of both kits and pre-built motorized bicycles. If you are not a typical nerd, seek a second opinion on your selected bicycle or kit before buying.