Frequently Asked Questions
This is the tire size information. Specifically, 225 means a tread width of 225 millimeters. 50 stands for the aspect ratio, i.e., 50% of the tread width is the sidewall height. “R” indicates the radial type of construction; 18 represents the diameter of the wheel in inches for which this tire is suitable.
It is a high-profile metric tire size with a section width of 225mm, a sidewall height of 50% of the section width, in this case, 225/2 = 112mm), a radial design, and a rim diameter intended for 18-inch wheels. Moreover, you can visit our fitment guide to find the perfect set of tires.
Even though the tread widths are similar, for example, 225, and only the dimensions of the profile indicator are different, 50 and 40, respectively, the 225/50R18 tire cannot be directly substituted for a 225/40R18. The differences in the aspect ratios, 50% for 225/50R18 and 40% for 225/40R18, indicate a taller sidewall. This increased difference would change speedometer readings, clearances, and even the tire’s handling characteristics.
The majority of 225/50R18 tires have a recommended pressure range of about 30–35 PSI when measured cold. However, the right pressure might be slightly dependent on your vehicle's make and model.
Note that most manufacturers recommend rotating every 5,000–8,000 miles to help ensure that all four tires wear out evenly and achieve the longest possible life for the tread. However, your rotation pattern could vary based on your alignment, driving behaviors, and even car type. You can check your vehicle’s owner’s manual to figure out the rotation schedule that suits you best.
