Road Bicycle

The term road bicycle is used to describe bicycles built for traveling at speed on paved roads. Some sources use the term to mean racing bicycle. Other sources specifically exclude racing bicycles from the definition, using the term to mean a bicycle of a similar style but built more for endurance and less the fast bursts of speed desired in a racing bicycle; as such, they usually have more gear combinations and fewer hi-tech racing features. Certain of these bicycles have been referred to as 'sportive' bicycles to distinguish them from racing bicycles.
Compared to other styles of bicycle, road bicycles share common features:

• The tires are narrow, high-pressure and smooth to decrease rolling resistance.
• They usually use multiple derailleur gears. (Single-speed and fixed gear varieties exist)
• The bicycle is of a lightweight construction.

The term road bicycle can also describe any type of bike used primarily on paved roads, in contrast to bikes primarily intended for off-road use, such as mountain bikes. Other road bikes include:

• Touring bicycles are designed for bicycle touring: they are robust, comfortable and capable of carrying heavy loads.
• Hybrid bicycles are designed for a variety of recreational and utility purposes. While primarily intended for use on pavement, they may also be used on relatively smooth unpaved paths or trails.
• Utility bicycles are designed for utility cycling: are a traditional bicycle for commuting, shopping and running errands in towns and cities. 
• Roadster a specific form of the Utility bicycle developed in the UK.
• Recumbent bicycles are designed for variety of recreational and utility purposes, but are characterized by the unusual riding position in which the cyclist is seated in a reclined position.