Although it is certainly possible to upgrade the size of your tires, it's best to stick with the size recommended by your vehicle's manufacturer in order to ensure optimal performance. In addition to giving your car a higher ground clearance, increasing the size of your tires may also benefit your car's handling, drivetrain performance, and fuel economy as well. Should you decide to increase the size of your tires, bear in mind the changes you may have to make to key figures, such as your vehicle's load index and speed rating, as well as how these changes could have an impact on your vehicle's capabilities.