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TIRE DIMENSIONS AND PARAMETERS







Tire parameters

Width
 The distance in mm between the sidewalls of the tire in its widest parts at rest.

Height
 The distance in mm between the inner rim and the corresponding top of tread at rest.

Inner diameter
 The diameter of the inner rim measured in inches.

Aspect ratio
A parameter calculated using the formula::
       (Height/Width) x 100

If there is no value for aspect ratio displayed, it means the aspect ratio is equal to 82.
For example : 155 R 13 = 155 / 82 R 13

STANDARD WAYS OF WRITING TIRE SIZES
Passenger car tires  165 / 70 R 13 55 H
165 / 70 R 13 55 H
Width
(mm)		 Aspect ratio Radial construction Inner diameter (in inches) Load index Speed symbol

Light-truck tires  185 / 65 R 16 106 / 104 L LT
185 / 65 R 16 106 / 104 L LT
Width (mm) Aspect
ratio		 Radial construc-
tion		 Inner
diame
ter
in inches		 Load index (single axle) Load
index
(dual axle) 		Speed
symbol 		Symbol
for light-
truck use.

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