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size of each tire is indicated by nominal width
and rim diameter in inches and mm. Radial structure
is indicated by the letter "R". For
some tires the aspect ratio is indicated by percentage.
Example
Radial
Tire: 40.00R57, 33.25R35, 445/85R25
Bias Tire: 30.00-51, 45/65-45
Star
Rating (SR), Ply Rating (PR) and Load Index
(LI) The load capacity of a tire is indicated
by the star rating (in case of radial tire)
and the ply rating (in case of bias tire). The
load index is applied in countries where the
ETRTO Standards are used.
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Overall
Diameter (OD) "Overall Diameter" is
twice the section height of a new tire, including
24-hour inflation growth, plus the nominal rim
diameter.
Overall
Width (OW) "Overall Width" is the
width of a new tire, including 24-hour inflation
growth, and including protective side ribs,
bars and decorations.
Static
Loaded Radius and Width (SLR, SLW)
"Static
Loaded Radius" is the shortest distance
from the axle center to the contact surface
of a tire and "Static Loaded Width"
is the overall width of a tire, mounted on the
approved rim at the specified inflation pressure
and placed still and vertically on a flat board,
and loaded with the specified load.
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