Run-Flat Tyres vs Standard: Should You Switch?

Run-flat tyres have become increasingly common as manufacturers remove spare wheels to save weight and improve boot space. If your car came with run-flats, you may be wondering whether to replace like-for-like, or switch to standard tyres. If you’re on standard tyres, you might wonder whether run-flats would give you extra peace of mind. Here’s an honest comparison.

How run-flat tyres work

There are two main types:

• Self-supporting (SSR/RFT) — a reinforced sidewall supports the car’s weight even when deflated. Most common on BMW, MINI and Mercedes cars.
• Support ring system — an internal ring supports the car if the tyre deflates. Less common.

Both types allow you to drive at reduced speed (typically 80 km/h maximum) for up to 80 km after a complete loss of pressure — enough to reach a tyre fitter without being stranded.

Advantages of run-flats

• No roadside tyre change needed — drive to safety
• Frees up boot space (no spare wheel)
• No loss of control in a sudden deflation — the stiff sidewall keeps the car stable

Disadvantages of run-flats

• Ride quality — stiffer sidewalls transmit more road noise and harshness. On North Wales back roads this is very noticeable.
• Cost — typically 30-40% more expensive than equivalent standard tyres
• Not always repairable — once run flat, many manufacturers say the tyre must be replaced even if no visible damage is apparent, as the sidewall may have sustained internal stress
• Less available — smaller range of sizes and brands, fewer stockists

Can you switch from run-flats to standard?

Yes, with caveats. If your car has no spare wheel and no tyre pressure monitoring system (TPMS), you’d be taking a risk — a slow puncture might not be noticed until the tyre is too damaged to drive on. Most modern cars do have TPMS, which mitigates this. We’d recommend carrying a quality tyre inflation kit (sealant + inflator) as an emergency measure if you switch to standard tyres on a car without a spare.

Can you switch from standard to run-flats?

In theory, yes. In practice, cars not designed for run-flats often have stiffer suspension tuned to compensate for the harsher ride — without this, run-flats on a standard car feel extremely firm. Most tyre manufacturers advise against fitting run-flats to cars not originally specced with them.

Not sure what’s right for your car? Call us — we stock both standard and run-flat options and can advise on the best choice for your vehicle and how you use it.