How do I change the tire size on my Audi A1?

I recently purchased a used Audi A1 and noticed that the tires are smaller than the recommended size. What size should I upgrade to and will it affect my car's performance?

Changing your tire size can have a big impact on your car's performance. It is always best to stick with the recommended tire size for your car. You can find this information in your vehicle manual or by consulting with a trained technician.