What does tire size mean?

2 Answers
Mark
07/24/25 10:50am
Tire size indicates the dimensions of a tire. Generally, the tire size used by a vehicle is printed on the sidewall of the tire. Different types of vehicles use different tire sizes. Taking a tire model of 250/60R15 as an example, 250 represents the width of the tire; 60 represents the aspect ratio of the tire; R stands for radial tire; and 15 represents the size of the tire. Car tires are one of the important components of a vehicle, directly contacting the road surface and working together with the vehicle suspension to mitigate the impact during driving, ensuring good ride comfort and smooth driving. They also ensure good adhesion between the wheels and the road surface, improving the vehicle's traction, braking, and off-road capability.
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Jesse
08/11/25 5:52am
I've been driving for over a decade, and tire sizes are like a vehicle's ID card, with numbers and letters like 225/65R17. The first number, 225, is the tread width in millimeters—wider tires offer better grip but consume more fuel. The 65 is the aspect ratio, representing the sidewall height as a percentage of the width; a higher percentage means better cushioning and a softer ride over bumps. The R stands for radial construction, which is standard for most passenger cars today. The 17 is the wheel diameter in inches—too small won't fit the rim, and too large is dangerous. Choosing the right size directly affects handling and safety. I've seen cases where the wrong size caused uneven wear and increased skidding in wet conditions, so always match the factory specs when buying or replacing tires—don't compromise safety for cost. Different road conditions also require different tires: narrower tires are more stable in snow, while wider tires perform better at high speeds, but always ensure the wheel rim is compatible.
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