Road bikes are designed for riding fast on paved streets. Along with the light-weight body, they have slim tires. The bikes are designed in a 
manner that requires you bend your upper part of the body giving pressure over the handle bars. Such a design is suitable for riding bikes over a long distance at higher speed and this in a way prevents you from getting tired. These bikes have a relaxed geometry that gives the riders a comfortable ride.
The road bike was built for swift travel on paved roads and are characterized by having a lightweight body and narrow tires. In addition, they are designed for traveling fast comfortably By design, a road bike
Three things need to be considered when you’re shopping for a road bike: 1. The bike frame 2. Frame Geometry 3. Bike components.
Frames
Four types of metals are normally used for these bikes: titanium, carbon fiber, aluminum, and steel. Additionally, bike manufacturers often use hybrids of a mixture of the above metals. Currently, carbon fiber is the most popular style of a frame for the road bike.
Frame Geometry
This encompasses the overall length of the frame tubes for the bicycle.
Bicycle Components
A Road bike’s components include the brakes, tires, wheels, brakes, chains, etc. For the most part, you get what you pay. So, if you pay more your bicycle will likely be more reliable and perform optimally. Even so, just because something costs more does necessarily mean it is a better deal. So, be sure to do your research.