4.4.2 Description and Operation
4.4.2.1 Tire Structure
4
3
3
6
2
5
7
1
FE04-1008b
1. Tread
The tread is the tire and road surface contacting part. Through
the friction it enables the vehicle driving, braking and
performances. It should have good wear resistance, puncture
resistance, impact resistance and heat dissipation properties.
2. Carcass
The main part that supports the load. It should have good
impact resistance and good resistance to flex.
3. Belt
The steel cord between the tread and the carcass that protects
matrix, it prevents the tread deformation, maintains the contact
with the ground, improves wear resistance and driving stability.
4. Cap Ply
A special ply on top of the belt, it prevents the belt from moving,
prevents the belt detached at high speeds and maintains the
tire size at high speeds.
5. Bead
Hanging plastic wire winding according to a certain shape
(square or hexagonal shape), it fixes the tire on the rim.
6. Triangle Strips
The filling material on the steel cord, it prevents the bead
spread and slows down the impact on the bead and prevents
the air entering into the molding.
7. Inner Liner
Component that maintains the air tightness in a tubeless tire,
made from special rubber, equivalent to the role of tube.
4.4.2.2 Tire Sidewall Mark Meaning and the
Pressure Instructions
Tire Sidewall Mark Meaning
Example: 205/60R15 91V
205 - Nominal Cross-section Width (Unit: mm)
60 - Flat Rate (High Aspect Ratio :%)
R - Radial Structure
15 - Nominal Rim Diameter (Unit: in)
91 - Load Index
V - Speed (240 km/h)
Common Speed Rating Table:
Speed Rating
Maximum Speed (km/h)
S
180
T
190
H
210
V
240
W
270
Y
300
ZR
240 or higher
Tire Pressure Instructions
Tire pressure has a decisive influence on the tire wear, fuel
consumption, fault and damage. For safety, driver must
maintain standard tire pressure and regularly check the tire
pressure.
–
The tire load capacity is corresponding to the tire inflation
pressure, which must be adjusted to a reasonable value
based on the vehicle load conditions.Climate and seasonal
changes should not be a reason for the tire pressure
adjustment.
–
During the initial use, a new tire outer sizes will change due
to the heated generated by flex, making tire pressure
reduced. After driving 24 hours or 2,000-3,000 km, check
and adjust the tire pressure.
–
Long time high-speed driving will increase tire pressure by
10% -15%.
1. Insufficient Tire Pressure
Suspension System
Wheels and Tires
4-55
EC718/EC718RV EC715/EC715RV 10/2009
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