You can either check the tire placard that is posted on the door jamb of the driver’s door, inside the door of the glove compartment, inside the fuel hatch or your owner’s manual to find out the original tire size for your vehicle. The tire information, all the numbers and letters that note the rating of the tire’s measurements, for the current tires that are on your vehicle can be found on the sidewall area of the tire. It is important to know how to read these numbers and letters on your tires.
However, it is important to know what tire size is suggested by your car’s manufacturer rather than just getting the tires that are currently on your car, as the suggested sizes will get you the best results. It is possible to change the wheel diameter, aspect ratio, size and width of your tires, however there are other things that must be considered before you can make the change.
The width of the tire is the measurement of how narrow or wide your tire is. The wider the width, the better the grip your car will have on dry asphalt, but the worse your gas mileage will be overall. Another thing to keep in mind is that tires that are too wide could end up rubbing on the body of your car and cause damage. You will get good winter traction from narrow tires, however narrow tires will decrease the safety of the vehicle. You need to make sure that there’s enough actual rubber hitting the pavement in order to keep it moving properly.
The measurement that determines the height of the sidewall and eventually affects the tire’s height is the aspect ratio. A tire that has a lower sidewall will improve cornering because of its stiffness, however it makes for a rough ride. Another thing you should know is that if you make too big of a change in the aspect ratio you might not know your actual speed because it can confuse the speedometer reading. If your goal is to get an accurate speed reading and improve the cornering of your vehicle, you should looking into buying a new set wheels and a “plus-one” set-up. Making this change will help you to upgrade the width and size of your tires without off-setting your car’s speedometer.
It is difficult, however, to change the wheel diameter of your car. You need to know that 16-inch tires will always be needed for 16-inch wheels. If you purchase new wheels you will have a new wheel diameter, however, but the plus-one set-up will be helpful. It is important to note though that there are different set-up formula requirements for the different variables between the plus-one, plus-two, plus-three, etc.