Wheel size is a very important factor when choosing tires for a car. Correctly selected tires help the car to hold the road well and increase driving safety. However, many car enthusiasts simply do not know how to determine the size of the rim and tire.
Instructions
Step 1
First, try to determine the width of the wheel. For the calculation, you can use the "popular" formula: if you subtract 20% from the tread width of a car wheel, then you will get the width of the wheel disc. So, for example, if your rubber is 255 mm, then the disc width will be 255 mm - 20% = 204 millimeters. To convert this value to centimeters, divide the resulting number by 10. You get 20.4 cm. And then divide by 2, 54 and get the size of the disc width equal to 8 inches (it is in them that the values for the wheels are mainly calculated). If you want to put the disc wider or narrower rubber, then remember that the recommended maximum difference between them is only 15%.
Step 2
So that you can determine the size of your wheel according to the available parameters, pay attention to the inscriptions directly on the tire. As a rule, it will indicate the size, which is indicated as follows: 6 x 14, 6.5 x 15, etc. Here, the first number is the width of the rim in inches and the second number is the diameter of the rim, again in inches. Based on these numbers, you can easily determine which tire size you need to purchase.
Step 3
When choosing a wheel by size, remember that the diameter of the rim varies from 10 to 23 inches on average (depending on the type of car). The width of the rubber profile can vary between 2, 3 and 4 inches. The smallest of these indicators are suitable for motorcycles, scooters and scooters, and the largest for more powerful transport.
Step 4
Also, if you decide to replace the disc or rubber with higher ones, then remember that in connection with this, several more parameters should change, for example, offset. Its size should decrease with increasing diameter of the wheel. Moreover, it is advisable to do this according to the formula: +0.5 inches = minus 6.5 mm from the distance from the axis of symmetry of the wheel to the landing plane of the disk attachment to the hub.
