What Are Run-Flat Tyres?
Run-flat tyres are specially constructed tyres with reinforced sidewalls that allow the vehicle to continue driving after a puncture — typically for up to 50 miles at a maximum speed of 50mph. They were developed to eliminate the need for a spare tyre and give drivers time to reach a garage or a safe location rather than stopping at the roadside in a dangerous situation.
How Do Run-Flat Tyres Work?
Standard tyres rely on air pressure to support the weight of the vehicle. When a run-flat tyre loses pressure, the reinforced sidewall takes over, supporting the car's weight mechanically. This allows you to keep driving safely to a tyre fitting service without stopping at the roadside.
Run-flat tyres are only effective in conjunction with a Tyre Pressure Monitoring System (TPMS), which alerts the driver that a puncture has occurred — since the difference in driving feel with a run-flat can be subtle.
Pros of Run-Flat Tyres
- No need to change a tyre at the roadside in the dark or rain
- Eliminates the need to carry a spare wheel (saving weight and boot space)
- Improved post-puncture vehicle control at speed
Cons of Run-Flat Tyres
- Significantly more expensive than standard tyres (often 50–100% more)
- Stiffer sidewall results in a harsher ride quality
- Cannot be repaired after a puncture in most cases — replacement is required
- Availability of specific sizes can be limited for mobile tyre services
Are Run-Flats Right for You?
If your vehicle was originally fitted with run-flats (common on BMW and MINI), continuing with them is generally sensible as your car may not have been designed to accommodate a spare. If you are switching from standard tyres, weigh up the cost vs the peace of mind. Our technicians at Saltire Mobile Tyres can advise on the best option for your specific vehicle.