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CAR WORLD


STANDARD TYRE - inflated tyre / deflated tyre
PIRELLI RUN FLAT TIRE - inflated tire / deflated tire
 

PERFORMANCE, SAFETY, PEACE OF MIND


Run Flat tires mean safety. They provide greater control of your car in emergency conditions and allow you to continue driving safely even during a rapid loss of inflation pressure.

With Run Flat, you will retain mobility in the event of a puncture. So, if your tire is punctured, even in pouring rain, the Pirelli Self-Supporting Run Flat means you don't have to bother with the spare. Instead, you can continue driving for a limited period.

To ensure maximum safety during an emergency situation, the Run Flat tyre must maintain certain speed and distance parameters (80km/h for 80km or 50mph for 50 miles). Due to these restrictions, it's imperative that motorists be notified when a loss in tire pressure occurs, and therefore the vehicle must be equipped with a TPMS (Tire Pressure Monitoring System) to detect and signal tire pressure changes.

 

OPERATING REQUIREMENT


Run Flat tires have been developed based on the specifications of the vehicles on which they are mounted. Accordingly, Run Flat tires may only be mounted on vehicles specifically manufactured to accommodate Run Flat tires.

Run Flat tires must be mounted in conjunction with a functional Tire Pressure Monitoring System (TPMS). The mounting of tires and installation of the TPMS should be carried out by a specialised dealer.

Pirelli certifies that after pressure loss, Run Flat tyres can continue to run for 80km (50 miles) at a maximum speed of 80km/h (50 mph). Always refer to the vehicle owner's manual for specific safety and operating information relating to the vehicle.

After the low pressure warning is shown, the condition of the remaining tires and the TPMS should be checked immediately by a specialised dealer.

A tire should always be changed and not repaired after a loss of pressure, as it is not always possible to establish the time and conditions under which the tire has been used with insufficient inflation pressure.

Damaged Run Flat tires, or Run Flat tires that have experienced a loss of pressure should be replaced immediately with another Run Flat tire of identical size and service description (Load Index and Speed Code). Pirelli recommends that a tire of a different type, or which contains a different load index or speed code, should never be mounted on the same vehicle.

After a loss of pressure, the rims should be inspected to ensure they haven't been damaged. Damaged or deformed rims should always be replaced prior to mounting a new Run Flat tire. Pirelli recommends the use of Extended Hump rims (EH2), which reduce the risk of bead unseating in case of loss of pressure.

Is it possible to fit a self-supporting run flat tire on standard H2 rims? If so, will it still work as a run flat tire and what are the implications?

Yes it is possible, although Pirelli strongly recommends that EH2 rims be used because they guarantee improved retention of the tire bead down to zero inflation pressure. In the event of run flat operation at zero pressure with H2 rims, provided that a Pirelli self-supporting run flat tire is used in conjunction with a Tire Pressure Monitoring System (TPMS) or air pressure warning system, the tire will maintain its run flat characteristics. A TPMS is absolutely necessary to alert the driver that the tire has lost pressure.


Can standard tires be fitted to EH2 rims? If so, will they work as run flat tires?

Standard tires can be fitted to EH2 rims but they will not have run flat features.


If one of my run flat tires sustains a puncture can I replace it with a standard tire?

Pirelli does not recommend mixing run flat tires and standard tires on the same vehicle, even if paired in axle sets. If you have a puncture, the run flat tires are designed to permit you to reach a tyre dealer where you can have the tire checked and replaced if necessary with another run flat tire. In exceptional and emergency circumstances a normal tire with identical dimensions, load index and speed code can be fitted for a very limited period and distance. It must be noted that standard tires do not have the same run flat characteristics as the other tires on your vehicle and must be removed at the earliest opportunity.


Can I mix Pirelli self-supporting run flat tires with another brand of run flat tire?

Yes, but Pirelli recommends that in a run flat condition you should not exceed 80km (50 miles) at a maximum speed of 80km/h (50 mph). Pirelli strongly recommends that the different tire brands should be fitted in axle sets and the tire pressure monitoring system must be controlled to make sure that the pressure settings are compatible.


Can I fit self-supporting run flat tires on my car?

Run Flat tires have been developed based on the specifications of the vehicles on which they are mounted. Accordingly, Run Flat tires may only be mounted on vehicles specifically manufactured to accommodate Run Flat tires, therefore you must contact the vehicle manufacturer if you are in doubt.


Can I repair a punctured Pirelli self-supporting run flat tire?

No, for safety reasons, Pirelli chooses not to recommend the repair of self-supporting run flat tyres. A self-supporting run flat tire should always be changed and not repaired after a loss of pressure because it is not always possible to establish the time and conditions under which the tire has been used with insufficient inflation pressure.


Can I use nitrogen instead of air to inflate my self-supporting run flat tires?

Yes.


Is it possible to extend the 80km (50 miles) tyre range of a punctured run flat tire by re-inflating the tire?

No. After a puncture you can only travel 80km (50 miles) at a maximum speed of 80km/h (50mph), following which the tire must be replaced.


What is the effect on performance when my self-supporting run flat tires are used in run flat conditions?

Provided the vehicle is operated within restricted run flat speed of 80km/h (50 mph), handling is only slightly impaired due to reduced cornering force. Aquaplaning and braking remain almost the same. It is recommended that you avoid sharp driving manoeuvres if a tire is completely deflated, especially if the tires are fitted to H2 standard rims.


In run flat conditions with a Pirelli self-supporting run flat tire, can I drive for more than 80km (50 miles) if I drive slower than 80km/h (50 mph)?

No. The maximum condition guaranteed by Pirelli is 80km (50 miles) at zero pressure at a speed not exceeding 80km/h (50mph). For vehicles fitted with Pirelli self-supporting Run Flat tires as original equipment, the tire manufacturer's recommendations indicated in the owners manual apply.


How does a tire pressure monitoring device work?

There are a range of tire pressure monitoring systems (TPMS) available so you should consult the vehicle manufacturer if you require a specific explanation. Basically there are two types of system, indirect systems use the fact that reduced air pressure causes the wheel to rotate at a slower speed and when they detect this difference send a warning to the driver. Direct systems directly control tire pressure against pre-set values and send a warning when actual pressure falls below set values.


How do I know if a tire is self-supporting run flat?

which appears on the sidewall of the tyre. On tires specifically homologated for BMW vehicles there are also the letters RSC which stand for Run Flat System Component.


Why vehicle handbook states that my run flat tires can operate for 100miles (160km) but all Pirelli literature states 80km? Which is correct?

Pirelli guarantee a general maximum distance of 80km for all self-supporting run flat tyres. Vehicle manufacturers conduct their own tests based on specific vehicle models, taking into consideration vehicle weight and characteristics and can decide together with the tire manufacturer can suggest an increased distance for that specific vehicle. For vehicles fitted with Pirelli self-supporting Run Flat tires as original equipment, the tire manufacturer's recommendations indicated in the owners manual apply.