Gmc 2007 Sierra User Manual download pdf (Page 560)

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101

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 performance

which all passenger car tires must meet under the

Federal Motor 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.

Warning: The temperature grade for this tire is

established 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 possible tire failure.

Wheel Alignment and Tire Balance

The tires and wheels on your vehicle were aligned

and balanced carefully at the factory to give you

the longest tire life and best overall performance.

Adjustments to wheel alignment and tire

balancing will not be necessary on a regular basis.

However, if you notice unusual tire wear or your

vehicle pulling to one side or the other, the

alignment may need to be checked. If you notice

your vehicle vibrating when driving on a smooth

road, your tires and wheels may need to be

rebalanced. See your dealer for proper diagnosis.

Wheel Replacement

Replace any wheel that is bent, cracked, or badly

rusted or corroded. If wheel nuts keep coming

loose, the wheel, wheel bolts and wheel nuts

should be replaced. If the wheel leaks air, replace

it (except some aluminum wheels, which can

sometimes be repaired). See your dealer if any of

these conditions exist.

Your dealer will know the kind of wheel you need.

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Gmc 2007 Sierra User Manual Page 560

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