Your tires are the only part of your car touching the road. Understanding their basic specifications is crucial for safety, performance, and making the right purchase. This guide will help you decode the numbers and letters on your tire sidewall.
The most important information is found in a sequence like: 275/60 R20. Let’s break it down:
· 275 (Tire Width): This is the tire’s width in millimeters. A wider tire generally offers better grip but may affect fuel economy.
· 60 (Aspect Ratio): This is the sidewall height as a percentage of the tire’s width. A lower ratio means a shorter sidewall, often improving handling and steering response.
· R (Construction): “R” stands for Radial, which is the standard construction for modern tires. Some tires may have “B” for Bias-ply.
· 20 (Rim Diameter): This indicates the diameter of the wheel rim in inches that the tire is designed to fit. It must match your vehicle’s wheels.
Other key markings include the DOT manufacturing date code (e.g., “3523” means the 35th week of 2023) and the Tread Wear Indicator (TWI) mark, which shows when the tread is worn to the legal limit of 1.6mm.
Always consult your vehicle’s owner’s manual or the label on the driver’s side door frame to find the manufacturer’s recommended tire size and inflation pressure. Choosing the right tires ensures a safer and more efficient driving experience.
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