Kia Sonet QY 2021 Owner's Manual page 392

Maintenance
WARNING
Tyre age
Replace tyres within the recom-
mended time frame. Failure to
replace tyres as recommended can
result in sudden tyre failure, which
could lead to a loss of control and an
accident.
4. Tyre ply composition and mate
rial
The number of layers or plies of
rubber- coated fabric in the tyre.
Tyre manufacturers also must indi-
cate the materials in the tyre, which
include steel, nylon, polyester, and
others. The letter "R" means radial
ply construction; the letter "D"
means diagonal or bias ply con-
struction; and the letter "B" means
belted-bias ply construction.
5. Maximum permissible inflation
pressure
This number is the greatest amount
of air pressure that should be put in
the tyre. Do not exceed the maxi-
mum permissible inflation pressure.
Refer to "Tyres and wheels" on page
9-5 for recommended inflation
pressure.
8 42
6. Maximum load rating
This number indicates the maximum
load in kilograms and pounds that
can be carried by the tyre. When
replacing the tyres on the vehicle,
always use a tyre that has the same
load rating as the factory installed
tyre.
7. Uniform tyre quality grading
-
Quality grades can be found where
applicable on the tyre sidewall
between tread shoulder and maxi-
mum section width.
For example:
TREADWEAR 200
TRACTION AA
TEMPERATURE A
Tyres degrade over time, even when
they are not being used. Regardless
of the remaining tread, we recom-
mend that tyres be replaced after
approximately six (6) years of nor-
mal service. Heat caused by hot cli-
mate or frequent high loading
conditions can accelerate the aging
process.
Tread wear
The tread wear grade is a compara-
tive rating based on the wear rate
of the tyre when tested under con-
trolled conditions on a specified
government test course. For exam-
ple, a tyre graded 150 would wear
one-and-a-half times (1 ) as well
Tyres and wheels