What is a hybrid bike
According to Wikipedia, hybrid bike is a bicycle designed for general-purpose utility or commuter cycling on paved and unpaved roads, paths, and trails. Also known under such names as City bike, Cross bike, or Commuter, the hybrid takes design features from both the road bike and mountain bike, with the goal of making a bike for general commuting and transportation.
In general, hybrids use the mountain bike’s triple crank, together with the latter’s handlebars giving a more upright posture than road bicycles. They also usually use one of the kinds of brakes used on mountain bikes, namely linear pull, or disc. From the road bicycle they take the 700C (larger) wheel diameter for higher speeds, but use a wider rim and tire for increased strength.
Different variations of the hybrid bicycle exist. As a category defined more by what it is not than by what it is, the lines between the variations are ambiguous, but they can be classified by the design goals. There are hybrid bicycles optimized for commuting, for use in urban environments, or for use on a variety of paved and unpaved road surfaces. For some bicycle manufacturers, differences in hybrid type or nomenclature have more to do with marketing focus rather than design and specification, though specific features of certain hybrid bikes may suit one need better than another.