A speed rating is a letter or a combination of a letter and a number which implies to what extent the tire successfully dissipates heat. Exceeding that speed will make the tire performance differ from the initial specifications. This may lead to anything from temporary traction loss to rapid deflation and irreparable damage.The rating doesn’t mean you can safely drive at the maximum speed for a long time however, especially in extreme weather conditions. You can only maintain that speed for about 10 minutes before the tire overheats and its performance deteriorates.Where to Search for a Speed Rating?You can find the rating in/on the:Owner’s manual.Tire sidewall.Driver’s side door jamb.Glove box door.Gas tank hatch.The owner’s manual has all the information you need about the recommended tires for your vehicle. Information placards on the door jamb, glove box door, and gas tank hatch are for the cases when you need a quick recommendation while on the go. As for the tire codes, there you...
