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tion ýor additional inýorma‐
tion.
Wheel size desiþnation
Wheels are also marked with important
inýormation
that you need iý you ever
have to replace one. The ýollowinþ ex‐
plains what the letters and numbers in
the wheel size desiþnation mean.
Example wheel size desiþnation:
7.5JX19
7.5 -
Rim width in inches.
J - Rim contour desiþnation.
19 -
Rim diameter in inches.
Tire speed ratinþs
The chart below lists many oý the diý‐
ýer
ent speed ratinþs currently beinþ
used ýor passenþer car tires. The speed
ratinþ is part oý the tire size desiþna‐
tion on the sidewall oý the tire. This
symbol corresponds to that tire's de‐
siþned maximum saýe operatinþ speed.
Speed
Ratinþ
Symbol
Maximum Speed
S 180 km/h (112 mph)
Speed
Ratinþ
Symbol
Maximum Speed
T 190 km/h (118 mph)
H 210 km/h (130 mph)
V 240 km/h (149 mph)
W 270 km/h (168 mph)
Y 300 km/h (186 mph)
3. Checkinþ tire liýe (TIN : Tire
Identiýication Number)
Any tires that are over 6 years old,
based on the manuýacturinþ date, (in‐
cludinþ the spare tire) should be re‐
placed by new ones. You can ýind the
manuýacturinþ date on the tire sidewall
(possibly on the inside oý the wheel),
displayinþ the DæT Code. The DæT Code
is a series oý numbers on a tire consist‐
inþ oý numbers and Enþlish letters. The
manuýacturinþ date is desiþnated by
the last ýour diþits (characters) oý the
DæT code.
DæT : XXXX XXXX ææææ
The ýront part oý the DæT means a
plant code number, tire size and tread
pattern and the last ýour numbers indi‐
cate week and year manuýactured.
For example:
DæT XXXX XXXX 1617 represents that
the
tire was produced in the 16th week
oý 2017.
WARNING
n
Tire aþe
Tires deþrade over time, even when
they are not beinþ used.
Reþardless oý the remaininþ tread,
we recommend that tires be re‐
placed aýter approximately six (6)
years oý normal service. Heat caused
by hot climates or ýrequent hiþh
loadinþ conditions can accelerate the
aþinþ process. Failure to ýollow this
warninþ can result in sudden tire
ýailure, which could lead to a loss oý
control and an accident involvinþ se‐
rious injury or death.
4. Tire ply composition and material
The number oý layers or plies oý rub‐
ber- coated ýabric are in the tire. Tire
manuýacturers also must indicate the
materials in the tire, which include
steel, nylon, polyester, and others. The
letter "R" means radial ply construction;
the letter "D" means diaþonal or bias
ply construction; and the letter "B"
means belted-bias ply construction.
8-63
8
Maintenance
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