Within Formula 1, aerodynamics is renowned to be highly important. The interactive fluid-car influences and even determines which car is the fastest in the Championship, hence the necessity to optimize and adapt the design of the car. However, given that the shapes of Formula 1 cars are complex; this project has only focused on the improvement of the aerodynamics of the rear wheels. For this purpose, an external component placed in front of the tires was designed. Before starting the optimization procedure, in order to understand the fluid behaviour and properly justify the decisions made from the simulation results, some basics of Fluid Mechanics were introduced. Therefore, the field of study had been defined and the theoretical framework in the project developed. Moreover, the designs of the Formula 1 cars have been sliced and detailed. In addition, in order to explain 3D geometry simulations were used and the optimization system was characterised and analysed. Formerly, the optimization procedure was carried out with the hope of improving the aerodynamic efficiency coefficient, which is the ratio between the downforce and drag force. During the process of this project, procedures were put in place to select the adequate parameter shapes that maximized the above ratio. All these tasks were carried out which then lead to the design of the component. Finally, once the aerodynamic element had been modelled, from different standpoints, its incorporation within the geometry of the car had been evaluated.