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What Does 245/45R17 Actually Mean?

Let's break it down simply: The 245 means this tire has a tread width of 245 millimeters. The 45 is the aspect ratio, which means the sidewall height is 45% of that width. The "R" stands for Radial construction (the modern standard for safety and durability), and finally, the 17 indicates that this tire perfectly fits a 17-inch wheel.