A flat bar road bike, also called a fitness bike is a relatively new style of bicycle. It is simply a road bike fitted with MTB-style shifters, brake levers and a flat handlebar. This combination provides a light, fast bike with a more upright and neutral riding position. A flat bar road bike is most commonly used for commuting, urban and fitness riding. Increase the stiffness of the area that transfers the power absorption and vertical, to avoid any waste of energy and have a more balanced behavior of the bike. The transfer of power takes place mainly through the head tube, down tube, bottom bracket and chainstays: high rigidity is required in these areas to reduce energy waste and increase the power transfer between the rider and the rear wheel.