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Being able to read and comprehend the information printed on a tire’s sidewall will make it easier for you to understand your tires and assist you in choosing a replacement set.

Tire Sizing Sytem
On the sidewall of a tire, its size, performance, etc. are shown by using numerical symbols.

  1. Nominal section width (mm)
  2. Aspect ratio (%)
  3. Construction code (Radial)
  4. Rim diameter (inch)
  5. Load index (775 kg)
  6. Speed symbol (300 km/h)

The LOAD INDEX is a numerical code associated with the maximum load a tire can support. The higher the tire’s load index number, the greater its load carrying capacity.

The SPEED SYMBOL indicates the maximum speed at which the tyre can carry a load corresponding to its Load lndex under service conditions specified by the tire manufacturer.

The ASPECT RATIO of a tire is determined by dividing a tire’s section height by its section width when the tire is: Inflated to maximum air pressure, Mounted on the approved measuring rim, and under no load.High performance tires usually have a lower aspect ratio than other tires. This is because tires with a lower aspect ratio provide better lateral stability. When a car goes around a turn lateral forces are generated and the tire must resist these forces. Tires with a lower profile have shorter, stiffer sidewalls so they resist cornering forces better.


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