Unsure what width to go for? Check out my comparison between 8″, 8.5″ and 9″ wide wheels. See the tires dimensions such as diameter.
Wheel size comparison code#
Now let’s take a look at what differences these changes in alloy and tire size actually create. Calculate tire size or compare a tire to an alternate tire size by entering the parts of the tire code below. This is of course achieved by having a 235/40 tire size as opposed to a 235/45 tire size which equates to a 12 mm (0.47 inch) difference in tire wall height.
There is a slight difference in the overall circumference but they are very similar so it does not have a big effect on the speedometer. The 18″ alloys have a 235/40 R18 tire size = overall circumference of 79.92 inches.The 17″ alloys have a 235/45 R17 tire size = overall circumference of 79.49 inches.The car comes with several wheel sizes including 17″ and 18″ options. In the table below youll find a comparison chart with those. Let’s use a 2022 Ford Focus as an example. For example an 2.50 X 17 size tire is 63MM in width ( 2.50 X 2.54CM ) and has een inch size of 17. The reason that I’m explaining all this is because it’s actually the change in the tires aspect ratio (profile height) when going from a 17″ to 18″ alloy which makes a difference, as well as the alloy size itself.
Wheel size comparison full#
In each case, the profile height is 40% of the first number (205 or 225 in this example). You will need your full tire size to get the correct fit for your vehicle, but you can start browsing options when you shop tires by wheel diameter. In this example, the 205/40 tire has a profile height of 82 mm, whereas the 225/40 tire has a larger profile height of 90 mm. The aspect ratio is a percentage of the width so means nothing unless you have that first number. For example, a 205/40 tire does not have the same profile height as a 225/40 tire. It’s important to remember that the profile height is an aspect ratio, and not a measurement that can be taken in isolation. Here are a couple of diagrams to demonstrate this point. However, in most cases car owners will compensate for a larger alloy by having a lower profile tire, to avoid issues with the speedometer by keeping the overall wheel size the same. Changing the overall size of the wheel will impact the speedometer.įor example, if you switch from 17 to 18 inch alloys and keep the tire profile height the same, then the wheel will take fewer rotations to cover the same distance so your speedometer will say that the car is going slower than it actually is. You don’t always have to match the overall wheel size completely to the stock size, however you do need to make sure that it will fit. Whenever you change the size of the alloy, the tire size must also change to ensure that the whole wheel comfortably fits into the wheel arch. Your wheel as a whole is of course made up of the alloy, and the tire. It can put your life in risk while you are driving.Before we jump into the comparisons between 17″ and 18″ alloys, we need to be clear on the connotations of changing the alloy wheel size. It is because we do not recommend using the tires which differ from your current tires in size more than 3%. If the difference in diameters is bigger than 3%, the result will be in red. Depending on the difference of tires, it can be in green or in red. At the bottom of the table you can see the final recommendation. Tire size comparison calculator instantly shows the difference between the tires and displays it in the table. If you want to do a side-by-side comparison of two different tire sizes, simply enter your current tire size, followed by the new tire size. Our tire size calculator uses inch measurements by default, but you can switch to metric system (cm) if you want. After you have entered all the parameters, click the green button "Calculate".
In the second row you need to specify the size of the new tires, or the tires that you are going to buy. The third field is for disc diameter in inches. The second box is for height and width ratio in percentages. In the first box you need to choose tire width in inches. WHAT IS IT The WTB Tire & Rim Compatibility Chart is used to determine what tire and rim width combinations provide optimal performance and compatibility. These indicators can be easily found on the sidewalls of your tires. In the top row you need to select the size of the tires that are on your car at the moment. This calculator allows you to tell the difference between the tires in inches, centimeters, and percentages. Our tire size calculator will help you estimate the difference of external dimensions of the wheels, height clearance, revolutions per mile and other characteristics, when installing tires of other sizes on your vehicle. Online tire size comparison calculator – choose the right tires for your car
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