Subaru 2004 Impreza - Manual (Page 478)

13-3
Consumer information and Reporting safety defects
– CONTINUED –
on straight-ahead braking traction tests, and
does not include acceleration, cornering, hy-
droplaning, or peak traction characteristics.
! Temperature A, B, C
The temperature grades are A (the highest), B, and C,
representing the tire’s resistance to the generation of
heat and its ability to dissipate heat when tested under
controlled conditions on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life,
and excessive temperature can lead to sudden tire
failure. The grade C corresponds to a level of perfor-
mance which all passenger car tires must meet under
the Federal Motor Vehicle Safety Standards No. 109.
Grades B and A represent higher levels of perfor-
mance on the laboratory test wheel than the minimum
required by law.
The temperature grade for this tire is estab-
lished for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation,
or excessive loading, either separately or in
combination, can cause heat buildup and pos-
sible tire failure.