JLG Triple-L Operator Manual User Manual
Page 65
SECTION 4 - SERVICE AND MAINTENANCE
3121224
– Triple-L-Trailer –
4-25
Speed Rating
The speed rating denotes the speed at which a tire is
designed to be driven for extended periods of time. The
ratings range from 99 miles per hour (mph) to 186 mph.
These ratings are listed below. Note: You may not find this
information on all tires because it is not required by law.
* For tires with a maximum speed capability over 149
mph, tire manufacturers sometimes use the letters ZR.
For those with a maximum speed capability over 186 mph,
tire manufacturers always use the letters ZR.
U.S. DOT Tire Identification Number
This begins with the letters "DOT" and indicates that the
tire meets all federal standards. The next two numbers or
letters are the plant code where it was manufactured, and
the last four numbers represent the week and year the tire
was built. For example, the numbers 3197 means the 31st
week of 1997. The other numbers are marketing codes
used at the manufacturer's discretion. This information is
used to contact consumers if a tire defect requires a recall.
Tire Ply Composition and Materials Used
The number of plies indicates the number of layers of rub-
ber-coated fabric in the tire. In general, the greater the
number of plies, the more weight a tire can support. Tire
manufacturers also must indicate the materials in the tire,
which include steel, nylon, polyester, and others.
Maximum Load Rating
This number indicates the maximum load in kilograms
and pounds that can be carried by the tire.
Maximum Permissible Inflation Pressure
This number is the greatest amount of air pressure that
should ever be put in the tire under normal driving
UTQGS Information
Treadwear Number
This number indicates the tire's wear rate. The higher the
treadwear number is, the longer it should take for the
tread to wear down. For example, a tire graded 400
should last twice as long as a tire graded 200.
Traction Letter
This letter indicates a tire's ability to stop on wet pave-
ment. A higher graded tire should allow you to stop your
car on wet roads in a shorter distance than a tire with a
lower grade. Traction is graded from highest to lowest as
"AA","A", "B", and "C".
Temperature Letter
This letter indicates a tire's resistance to heat. The temper-
ature grade is for a tire that is inflated properly and not
overloaded. Excessive speed, under-inflation or excessive
loading, either separately or in combination, can cause
heat build-up and possible tire failure. From highest to
lowest, a tire's resistance to heat is graded as "A", "B", or
"C".
Additional Information on Light Truck and
Trailer Tires
Please refer to the following diagram.
Tires for light trucks have other markings besides those
found on the sidewalls of passenger tires.
LT
The "LT" indicates the tire is for light trucks or trailers.
ST
An "ST" is an indication the tire is for trailer use only.
Max. Load Dual kg (lbs) at kPa (psi) Cold
This information indicates the maximum load and tire
pressure when the tire is used as a dual, that is, when four
tires are put on each rear axle (a total of six or more tires
on the vehicle).
Max. Load Single kg (lbs) at kPa (psi) Cold
This information indicates the maximum load and tire
pressure when the tire is used as a single.
Load Range
This information identifies the tire's load-carrying capabili-
ties and its inflation limits.
LETTER RATING
SPEED RATING
Q
99 mph
R
106 mph
S
112 mph
T
118 mph
U
124 mph
H
130 mph
V
149 mph
W
168 mph *
Y
188 mph *
Maximum load
& inflation when
used as a dual
Maximum load
& inflation when
used as a single
Load inflation
limits
Light
truck tire
Load
range
Severe snow
conditions
T
IR
E
NA
M
E
L
T2
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