As a driver in Cincinnati, OH, it's important to understand the information printed on your vehicle's tire sidewalls. Those numbers and letters may seem like gibberish at first glance, but they actually provide crucial specifications about the tire's size, performance capabilities, and more. And as Nissan tire care experts, we'll break down the meaning behind tire sidewall numbers so you can make informed decisions when it comes to tire maintenance and replacement.
Decoding the Tire Size
The most prominent information on a tire sidewall is the tire size. For example, a common tire size looks something like this: P215/65R15. Drivers in nearby Fairfield may wonder what each part represents. Here's the breakdown:
- P indicates the tire is intended for passenger vehicles
- 215 is the width of the tire in millimeters from sidewall to sidewall
- 65 is the aspect ratio, which is the height of the tire sidewall as a percentage of its width
- R means it's a radial tire, the most common type
- 15 is the diameter of the wheel rim in inches
Load Index and Speed Rating
Following the tire size, you'll usually see two more numbers, such as 95H. The first number is the load index, which corresponds to the maximum weight the tire can support when properly inflated. Harrison residents can find load index charts online that show the pound limit for each number. The letter is the speed rating, indicating the maximum speed the tire can safely handle. For instance, H means the tire is rated for speeds up to 130 mph.
Treadwear, Traction and Temperature Grades
Tire sidewalls also include a set of letters and numbers that look something like this: 400 AB. For Norwood drivers, here's what those mean:
Other Sidewall Information
There are a few other key details you may see on the sidewall. The DOT code indicates the tire meets Department of Transportation safety standards. There are also markings showing the maximum air pressure, the tire's composition and materials, and the date of manufacture. Springdale OH vehicle owners should keep in mind that tires six years old or older may need replacement due to rubber degradation, even if there's adequate tread left.
By understanding what tire sidewall numbers mean, Cincinnati area drivers can better evaluate tire condition, know their vehicle's capabilities, and make smart choices when buying replacements. If you have any other tire-related questions, don't hesitate to contact the knowledgeable service team at Jeff Wyler Nissan of Cincinnati - we're happy to help keep you rolling smoothly and safely!
- 400 is the treadwear grade, which estimates how long the tire tread will last compared to a baseline tire rated at 100
- A is the traction grade, indicating the tire's ability to stop on wet pavement from best (AA) to worst (C)
- B is the temperature grade, representing the tire's resistance to heat from best (A) to worst (C)