Volkswagen Polo Service & Repair Manual: Run-Flat Tire, Structure and Identification, SST Tire
| Run-Flat Tires, Dismounting and Mounting. Refer to
→ Chapter „Tires, Mounting“. |
| A Tire Pressure Monitoring Display is Necessary When Using
Run-Flat Tires. |
| Tire Damage and the Pressure Loss Resulting From it is Not
Always Recognizable. |
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| SST tires are identified with a special code (RSC = Run-flat
System Component) on the side wall. |
| The Identification on the Side Wall of Run-Flat Tires can
Differ Depending on the Manufacturer. |
| Self-Supporting Tire stands for a tire system with emergency
running characteristics in the event of a loss of pressure. In
the event of a flat tire, the driver can continue driving to a
limited extent to the next workshop Owner's Manual. |
| SST tires make it possible to drive up to 50 km at a maximum
of 80 km/h (49.7 mph) even with a complete loss of pressure. |
| Driving style, speed, road surface, weather conditions, tire
condition and tire load influence the distance. |
| With SST tires, it is not necessary to immediately change a
tire when it suffers from a complete loss of pressure (e.g. no
tire changing in an area with low visibility or in dangerous
conditions). |
| Braking, steering and driving performance remain for the
most part after the tire looses pressure. |
| A spare wheel is no longer necessary when using SST tires.
From the view of the customer, this means: saving space and
weight. |
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| 1 - |
Bead with bead bundle |
| 3 - |
Sidewall reinforcement |
| 4 - |
Rim with extended hump (EH2) on both sides - required when
using run-flat tires |
| Standard Tires Without Emergency Running Characteristics |
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| – |
-I- standard tires with air. |
| – |
-II- standard tires without
air. |
| – |
If the standard tire loses air, the rim presses the side
wall together. The rubber in a flat tire is heated strongly and
quickly loses its properties. |
| SST Tires with Reinforced Side Wall |
| The self-supporting, reinforced side walls form the basis of
SST technology. |
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| – |
-I- SST tires with air. |
| – |
-II- SST tires without air. |
| – |
Especially thick side walls -A-
support the empty tires on a standard rim and the vehicle
remains maneuverable. A special rubber mixture reinforces the
tires and supports the vehicle in an emergency. |
| The reinforced side walls, unlike a standard tire, prevent
the tire flanks from pinching between the road and rim when
flat. |
| Difference in Version H2 and EJ2 Extended Hump Rim
|
| The increased hump on the EH2 Extended Hump Rim prevents the
SST tire from springing off when pressure is lost. |
| EH2 builds up toward the center of the wheel. |
WARNING
| The clearance to the brake is reduced. |
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1 -
Tread Block
2 -
Tread Groove
3 -
Tread
4 -
Nylon Ply
5 -
Belt ...
The vehicle can be equipped with run-flat tires as an
option.
The Seal Inside technology is a system that allows the
vehicle to continue ...
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Cross-Section of a Radial Ply Tire
Run-Flat Tire, Seal Inside-Technology