Q: What should I do when a loss of tyre pressure occurs?
A: If the tyre pressure monitoring system signals that inflation pressure has been lost you can continue to drive with Runflat tyres (RFT). Please follow instructions in the manual of your car and proceed to the nearest RFT authorised dealer to have your tyres inspected.
Q: How far can I drive after I am alerted to a deflated tyre?
A: Bridgestone Runflat tyres are typically capable of travelling for a maximum of 80km at 80km/h after a tyre suffers deflation. However, the vehicle manufacturer may specify a different speed or distance for RFT tyres fitted to specific vehicles and owners should consult their vehicle handbook for details.
Q: Do I still have to check my tyre pressures if I have a Pressure Monitoring System (TPMS).
A: Yes it is still essential that you check and adjust your tyre pressures at regular intervals, Bridgestone recommends every month.
Q: Can I repair a punctured Bridgestone Runflat tyre?
A: Bridgestone RFT tyres marked "Do Not Repair" must be replaced if punctured, and cannot be repaired.
Q: How can we detect a loss of tyre pressure?
A: The vehicles tyre pressure monitoring systems (TPMS) alerts a driver when a tyre's pressure drops below agreed limits. Since RFT tyres keep functioning safely for 80km at 80km/h after losing pressure, a driver might not otherwise notice the loss of pressure. Therefore, any vehicle using Runflat tyres must be equipped with a tyre pressure monitoring system.
Q: How does a tyre pressure monitoring device work?
A: There are a range of tyre 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 higher speed and when this occurs an alarm is triggered. Direct systems, directly monitor tyre pressure against pre-set values and send a warning when actual pressure falls below set values. A thorough explanation is given in the RFT technology section.
Q: Are all tyre dealers able to fit RFT tyres? A:
Only RFT authorised dealers should fit RFT tyres due to the specialised equipment and training required.
Q: What is the threshold pressure below which a tyre is deemed to have been Runflat?
A:The international standard ISO 16992:2006 states that below 70 kPa an RFT tyre is deemed to have been run flat.
Q: Can a tyre whose pressure has dropped to not less than 70 kPa be inflated and used as normal if no repair is required?
A: Yes. But if an RFT tyre has undergone a significant pressure drop for any period of time Bridgestone recommend that tyres are inspected by an RFT authorised dealer.
Q: Can Runflat tyres be fitted to any car?
A: No, Runflat tyres should only be fitted to vehicles that come with Runflat tyres as original equipment and have a TPMS. Any vehicle that has Runflat tyres requires a TPMS or the driver might not realise that a tyre has been punctured. Furthermore, Runflat tyres are specifically tuned to the suspension of individual vehicles meaning they are inappropriate for fitment to other vehicles.
Q: If one of my Runflat tyres sustains a puncture can I replace it with a standard tyre?
A: Bridgestone do not recommend mixing Runflat tyres and standard tyres on the same vehicle, even if paired in axle sets. If you have a puncture, the Runflat tyres are designed to permit you to proceed to a tyre dealer where you can have the tyre checked and replaced if necessary with another Runflat tyre. In exceptional and emergency circumstances a conventional tyre of the same size can be fitted. It must be noted that standard tyres do not have Runflat characteristics and should be removed at the earliest opportunity.
Q: Are there any impacts on the other features of a car?
A: No. Runflat systems do not have any major impact on other vehicle features.
Q: What inflation pressure should I use for a Runflat tyre?
A: For tyre pressures, always refer to the vehicle placard (usually located inside the drivers side door or in the glovebox), owners manual or handbook for the manufacturers recommendation.
Q: Will Runflat tyres be widely used in the future?
A: The demand for this kind of technology is now increasing as awareness of safety and ecological problems rise year after year. Bridgestone continue to address safety and environmental issues through our products.
Q: Can I use nitrogen instead of air to inflate my Bridgestone Runflat tyres?
Q: Do Bridgestone Runflat tyres have any effect on comfort or other performance when compared with standard tyres (handling, mileage, etc.)?
A: Vehicles fitted with RFT tyres have specially tuned suspension to compensate for the increased tyre rigidity that is a feature of RFT tyres. Hence vehicles fitted with Bridgestone Runflat tyres provide comparable mileage and handling performance with little or no loss of comfort but, with the exceptional added safety value of a Runflat tyre.
Q: What is the effect on performance when my Runflat tyres are used in Runflat conditions?
A: Provided the vehicle is operated within restricted Runflat speed of 80km/h, handling is only slightly impaired due to reduced cornering force. It is recommended that sharp driving manoeuvres be avoided if the Tyre Pressure Monitoring System (TPMS) is triggered.
Q: How do I know if a tyre is Bridgestone RFT?
A: A Bridgestone Runflat tyre can be identified by the RFT logo which appears on the sidewall of the tyre.
Q: My vehicle handbook states that my Runflat tyres can operate for 160km but all Bridgestone literature states 80km ? Which is correct?
A: Vehicle manufacturers conduct tests on specific vehicle models, taking into consideration vehicle weight/characteristics and together with the tyre manufacturer can suggest a distance for that specific vehicle. For vehicles fitted with Bridgestone Runflat tyres as original equipment, the vehicle manufacturer's recommendations indicated in the owner's manual apply.