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420 STARTING AND OPERATING
– Ratio of section height to section width of tire, or
10.5 = Section width in inches (in)
R = Construction code
– R means radial construction, or
– D means diagonal or bias construction
15, 16, 18 = Rim diameter in inches (in)
Service Description:
95 = Load Index
– A numerical code associated with the maximum load a tire can carry
H = Speed Symbol
– A symbol indicating the range of speeds at which a tire can carry a load corresponding to
its load index under certain operating conditions
– The maximum speed corresponding to the speed symbol should only be achieved under
specified operating conditions (i.e., tire pressure, vehicle loading, road conditions, and
posted speed limits)
EXAMPLE:
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