Chevrolet 4500 HD 2023 Manual page 291

290 Vehicle Care
It is not easy to visually identify an
under-inflated dual-wheel tire or low aspect
ratio tire (aspect ratio at 70%). Always use
an appropriate tire air pressure gauge to
check the air pressure of any tire.
If your vehicle is equipped with aluminum
wheels, use an extension attached to the
inner tire valve together with a standard tire
air pressure gauge or use a special air
pressure gauge when checking the air
pressure of a dual-wheel's inner tire.
Cracks and Other Damage
1. Sidewall surface
2. Gap between inner and outer tires
3. Tread
Check the tread and sidewall surfaces of
each tire for cracks or other damage.
Especially check the tread for nails or other
metal pieces embedded in grooves and also
the gap between the inner and outer tires
of a dual-tire wheel for pebbles lodged in it.
When checking tires, pay special attention
to: low air pressure; pebbles or nails in
tread grooves; cracks or other damage on
tire surfaces; uneven wear; and pebbles
lodged in the gap between tires of
dual-wheel tires.
Tread Depth and Abnormal Wear
Tread Wear Indicator Position Mark
(Example)
Tread Wear Indicator (Example)
1. Lug pattern
2. Rib pattern
Using worn-out tires is dangerous because
they might have an increased chance of
getting punctured or bursting while driving.
Check all tires to see if tread wear indicators
appear on their treads and also check their
entire tread for its depth with a depth
gauge to make sure that the grooves are
deeper than the specified depth. A tire with
tread wear indicators appearing must be
changed. Also, check the tires for uneven or
otherwise abnormal wear.