VW Golf manuals

Volkswagen Golf Service & Repair Manual: Run-flat tyres, structure and identification of a SST tyre

Removing and fitting run-flat tyres → Chapter.
If run-flat tyres are used, a Tyre Pressure Monitor display must be fitted.
Damage to the tyre and the resulting pressure loss cannot be detected with the naked eye.
   
SST tyres are identified by a specific sign (RSC = Runflat System Component) in the sidewall.
The identification for run-flat tyres on the sidewall may differ depending on the manufacturer.
Self-supporting tyres are tyre systems with run-flat capabilities in the case of pressure loss. In case of a deflated tyre, the driver can still drive to the next workshop whereas some restrictions must be adhered to → Owner's manual.
Advantage
In case of a complete pressure loss, the SST tyres allow for moderate driving with a maximum speed of 80 km/h and over a maximum distance of 50 km.
The distance that can be travelled during a breakdown depends on the driving style, the vehicle speed, the road condition, the weather conditions, the condition of the tyres, and the tyre load.
In case of a complete pressure loss, the wheel must not be changed immediately, if SST tyres are fitted (e.g no wheel change in poorly visible and hazardous road sections).
The brakes, the steering system and the drive train feel similar, even after a complete pressure loss in the tyre.
If SST tyres are used, no spare wheel is required. This allows for more space and a lower weight in favour of the customer.
 

Run-flat tyres, structure and identification of a SST tyre

Body
1 -  Beading with beading core
2 -  Side wall
3 -  Reinforced side wall
4 -  Wheel rim with extended hump (EH2) on both sides - prerequisite when using tyres with run-flat properties
Detailed information on the technology
Standard tyres without run-flat capabilities
 

Run-flat tyres, structure and identification of a SST tyre

–  -I- Standard tyres with regular tyre pressure
–  -II- Deflated standard tyre
–  When a standard tyre deflates, the side walls are pressed together by the wheel rims. The rubber material heats up extremely and comes off the tyre quickly when the tyre is deflated.
SST tyres with reinforced sidewall
The SST technology is based on self-supporting reinforced sidewalls.
 

Run-flat tyres, structure and identification of a SST tyre

–  -I- SST tyre with regular tyre pressure
–  -II- Deflated SST tyre
–  Extra thick sidewalls -A- support the deflated tyre on a standard wheel rim, and the vehicle remains operable. A special rubber compound reinforces the tyre and is capable of carrying the vehicle in an emergency.
The reinforced sidewalls do not become pinched between the road and the wheel rim if the tyre is deflated.
Differences between H2 wheel rims and EH2 wheel rims with extended hump
In case of a pressure loss, the extended hump of wheel rim EH2 prevents the SST tyre from becoming detached from the wheel rim.
The extended hump wheel rim EH2 is higher relative to the centre of the wheel.
  WARNING
There is a smaller clearance to the brake.
 

Run-flat tyres, structure and identification of a SST tyre

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