Winter tyres
3PMSF Symbol
The three-peak mountain snowflake (3PMSF) symbol confirms the tyre meets minimum performance standards on packed snow. It is not the same as a M+S marking, which is a self-certification with no independent test.
Speed Index
Most winter tyres carry a Q (160 km/h) or T (190 km/h) rating. If you drive on motorways, check the speed index and do not exceed the marked limit on winter rubber.
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.
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SCORPION™ WINTER
Pirelli
285/45R19, 285/45R21