Run-flat tyres are built with reinforced sidewalls so the car can keep moving after a puncture, typically for around 50 miles at up to 50mph. That's enough to reach a fitter safely without changing a wheel at the roadside. But they come with important limits and rules.
How run-flats work
A standard tyre collapses when it loses air. A run-flat's stiffened sidewall temporarily supports the vehicle's weight even at zero pressure. Because you may not feel the puncture, run-flats require a working TPMS to alert you, that's why TPMS and run-flats go together.
The limits
- Distance and speed limited, usually ~50 miles at ~50mph after a puncture (check your handbook).
- Often not repairable. Once run flat, the structure is usually compromised, so it's a replacement.
- Replace like for like. Mixing run-flats and standard tyres isn't recommended.
- Firmer ride due to the stiffer sidewall.
Do you have run-flats?
Look for markings such as RFT, ROF, SSR, EMT or ZP on the sidewall, or check your handbook. If your car came with run-flats and no spare, that's by design.
Punctured a run-flat?
Don't exceed the speed or distance limit, and get it checked promptly, most need replacing. We carry run-flats and fit them at your location across London and Birmingham. Book a replacement or call our 24-hour line.
