Mercedes Benz 2007 sl 550 ユーザーズマニュアル

The temperature grades are A (the high-
est), B, and C, representing the tire’s resis-
tance 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 tem-
perature can cause the material of the tire 
to degenerate and reduce tire life, and ex-
cessive temperature can lead to sudden 
tire failure. The grade C corresponds to a 
level of performance which all passenger 
car tires must meet under the Federal Mo-
tor Vehicle Safety Standard No. 109. 
Grades B and A represent higher levels of 
performance on the laboratory test wheel 
than the minimum required by law.

1 Plies in sidewall
2 Plies under tread

This marking tells you about the type of 
cord and number of plies in the sidewall 
and under the tread.

G

The temperature grade for this tire is estab-

lished for a tire that is properly inflated and 

not overloaded. Excessive speed, underin-

flation, or excessive loading, either sepa-

rately or in combination, can cause 

excessive heat build-up and possible tire 

failure.

i