Read the tire symbols

  • 2018.11.15
  • 1686Browse


Ratio (%):

Also called aspect ratio, section height / section weight. The section weight is half as the difference between outside diameter and rim diameter.The lower the ratio is, the wider the section width will be, which means it will be safer to drive. The elasticity of sidewall will increase corresponding to the section width to make driving more stable. The high-speed cars using low ration tires is a trend nowadays.
Speed Rating:
The speed level is marked on sidewall of every tire, which will indicate the maximum speed. For example: for the size 255/45R20 105W, the speed level is W, so that the max speed will be 270Kilometer/hour by referring the speed comparison table.
Loading Index:

The loading index is marked on sidewall of every tire, and the max loading capacity is marked as well. For example: for the size 255/45R20 105W, the loading index is 105, which corresponds the max loading capacity is 925 kilograms. Overloading will make tire over heated and break abruptly.

         255         /          45           R                   20                    105                     W
Section width              Ratio     Radial      Rim Diameter      Loading Indexr     Speed Level
Section width (mm) :
the distance between both sides when inflated.