When It Is Time for New Tires
Various factors, such as maintenance, temperatures,
driving speeds, vehicle loading, and road conditions,
influence when you need new tires.
One way to tell when it is
time for new tires is to
check the treadwear
indicators, which appear
when your tires have
only 1/16 inch (1.6 mm) or
less of tread remaining.
Some commercial
truck tires may not have
treadwear indicators.
You need new tires if any of the following statements
are true:
• You can see the indicators at three or more places
around the tire.
• You can see cord or fabric showing through the
tire’s rubber.
• The tread or sidewall is cracked, cut, or snagged
deep enough to show cord or fabric.
• The tire has a bump, bulge, or split.
• The tire has a puncture, cut, or other damage that
cannot be repaired well because of the size or
location of the damage.
The rubber in tires degrades over time, even if they are
not being used. This is also true for the spare tire, if
your vehicle has one. Multiple conditions affect how fast
this aging takes place, including temperatures, loading
conditions, and inflation pressure maintenance. With
proper care and maintenance tires will typically wear out
before they degrade due to age. If you are unsure
about the need to replace your tires as they get older,
consult the tire manufacturer for more information.
Buying New Tires
The original equipment tires installed on your vehicle,
when it was new, were designed to meet the Tire
Performance Criteria Specification (TPC spec) system
rating. If you need replacement tires, we strongly
recommend that you get tires with the same TPC Spec
rating. This way, your vehicle will continue to have tires
that are designed to give the same performance and
vehicle safety, during normal use, as the original tires.
The exclusive TPC Spec system considers over a dozen
critical specifications that impact the overall performance
of your vehicle, including brake system performance,
ride and handling, traction control, and tire pressure
monitoring performance. The TPC Spec number
is molded onto the tire’s sidewall near the tire size.
5-64
2008 - Isuzu 290/370 Owner Manual
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