Hybrids are a compromise between a mountain and racing style Bicycle.
The tandem bicycle is designed to be ridden by more than one person.
Road Bicycles are built for traveling at speed on paved roads.
Mountain Bicycles are designed for off-road cycling.
Hybrid bicycles are a compromise between the mountain and racing style bicycles which replaced European-style utility bikes in North America in the early 1990s. They have a light frame, medium gauge wheels, and derailleur gearing, and feature straight or curved-back, touring handlebars for more upright riding.
Compared to a conventional bicycle, a tandem has double the pedalling power, without necessarily doubling the speed, and with only slightly more frictional loss in the drivetrain.
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.