As the name suggests, outside is not a brand of tires, but rather refers to the outer side of the tire. It is a direction indicator for the installation of single-direction and mixed-type tires. When repairing or replacing tires, it is important to check if the outside side is installed correctly as it can affect the performance of the tire such as its braking and grip. Tires are circular elastic rubber products that are typically installed on metal wheels to support the vehicle's weight, absorb shocks, and provide good traction between the vehicle and the road surface.