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How does a RunFlat tire work?

Standard tires rely entirely on air pressure to support the weight of the vehicle. When a standard tire loses pressure, its sidewalls collapse, making the tire undriveable within seconds. A RunFlat tire solves this problem through reinforced self-supporting sidewalls — typically made from stiffened rubber or a rigid insert — that can bear the vehicle's load even with zero inflation pressure. The exact distance and speed you can drive on a flat RunFlat tire depends on the manufacturer, vehicle, and conditions, but the industry standard is typically 80 km (50 miles) at a maximum speed of 80 km/h (50 mph). This is enough to safely reach a tire dealer in most urban and suburban environments.

RunFlat naming by brand

Different manufacturers market RunFlat technology under different names: Bridgestone — DriveGuard RFT, Turanza T005 RFT, Potenza S001 RFT Pirelli — RUNFORWARD™, Run Flat (marked RF on the sidewall) Michelin — ZP (Zero Pressure), marked with the ZP sidewall label Goodyear — RunOnFlat (ROF), ExtendedMobility Technology (EMT)

Advantages of RunFlat tires

No need to carry a spare wheel or tire inflation kit Eliminates roadside tire changes — safer in traffic or at night Maintained vehicle handling even after pressure loss (no sudden swerve) Space and weight savings where a spare was previously stored

Things to consider

RunFlat tires are generally more expensive than standard equivalents Ride quality is slightly firmer due to the reinforced sidewall construction Many RunFlat tires cannot be repaired after a puncture and must be replaced A Tire Pressure Monitoring System (TPMS) is essential — you may not feel the pressure loss without one Not all vehicles are compatible with RunFlat tires; always check manufacturer recommendations

How to identify a RunFlat tire

Look for the following markings on the tire sidewall: RFT, RUN FLAT, ROF, EMT, ZP, SSR (Self-Supporting Runflat) or RF. On widetyres, you can filter the full catalog by RunFlat capability to instantly find every available RunFlat option for your size.

What does XL mean technically?

XL tires are inflated to higher air pressures than their standard-load equivalents — typically around 2.9 bar (42 psi) vs. 2.5 bar (36 psi) at maximum load. The reinforced carcass and bead construction allows the tire to withstand these higher pressures, enabling a higher load index for the same physical size. In practical terms: an XL tire in the same size and speed rating as a standard tire can carry approximately 10–15% more weight.

Who needs XL tires?

XL tires are required — not optional — when: Your vehicle manufacturer specifies XL in the tire fitment data (check the door jamb sticker or owner's manual) You drive a heavier vehicle where the axle load exceeds the capacity of a standard tire Your car runs high tire pressures by design (common on performance and EV models) You are replacing OEM fitments that were originally XL If your car came from the factory with XL tires, you must fit XL replacements. Fitting standard-load tires instead is not simply a downgrade — it is dangerous, as the tire will be underrated for the load it carries.

XL and EVs

Electric vehicles are among the most common XL tire applications, because their battery packs make them significantly heavier than comparable combustion-engine cars. Many EV-specific tire variants are XL as standard, and it is not unusual to see XL specified as mandatory on vehicles such as the Tesla Model 3, BMW iX, or Mercedes EQS.

How to identify an XL tire

Look for the marking XL or EXTRA LOAD or Reinforced (RF) on the tire sidewall, adjacent to the size designation. On WIDEtyres, you can filter the full catalog by XL to see every available extra-load option for your size.

What happens if you fit the wrong load rating?

Running an SL tire where XL is specified means the tire will be overloaded at the recommended inflation pressure. This can lead to accelerated sidewall wear, heat build-up, unpredictable handling, and in the worst case, a catastrophic tire failure at speed. Always match or exceed the original load specification.

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