How to Interpret Tire Specifications?

[OArya]

Tire specification parameters represent the tire's width, aspect ratio, tire type, and applicable size. Taking the 225/60R17 model as an example: 1. 225 indicates the tire section width is 225mm; 2. 60 is the aspect ratio, meaning the tire's sidewall height is 60% of the tire section width; 3. R stands for radial tire; 4. 17 indicates the tire is suitable for 17-inch rims. Radial tire: The tread part is reinforced with steel belts, allowing it to withstand higher internal pressure stress, featuring less tread deformation, better ground grip, and stability, making it more suitable for high-speed driving. Nowadays, radial tires are commonly used in passenger cars.

[DelMariana]

Do you get confused by all those numbers and letters every time you change tires? I used to be the same. That string of codes is actually quite simple. Take 205/55 R16 91V for example: 205 is the tire width in millimeters; 55 is the aspect ratio, meaning the sidewall height as a percentage of the width—the higher the number, the better the cushioning; R stands for radial construction, which is standard for most tires today; 16 is the rim diameter in inches; 91 is the load index—don’t exceed the limit specified in your manual; and finally, V is the speed rating, with a maximum speed of 240 km/h. Remember these, and you won’t be fooled when picking new tires.

[DelElizabeth]

With 20 years of car repair experience, reading tire specifications is like reading a menu. Focus on three sets of numbers: the first three digits, such as 215, indicate the tread width; the middle two digits, like 65, represent the aspect ratio; and the rim diameter comes last. Don’t overlook the letter R, which stands for radial construction, offering better heat dissipation and longer lifespan. The load index 91 means a maximum load capacity of 615 kg, and the speed symbol H corresponds to a top speed of 210 km/h. Choosing the wrong model may increase fuel consumption and cause steering wheel vibration—always check the original tire specification card on the door frame.

[JosieRose]

Don't be intimidated by tire labels as a beginner! Just follow these three simple steps: First, look at the number to the left of the slash, such as 195, which indicates the tire width; the number after the slash, like 55, represents the aspect ratio—lower numbers mean thinner tires; the letter R stands for the internal structure; the next two digits indicate the rim size; finally, the alphanumeric combination, such as 89T, where 89 is the load rating and T is the speed limit of 190 km/h. The aspect ratio is crucial—below 40, tires are prone to bulging, while a ratio of 55-65 offers the best balance for daily commuting.