How Run-Flat Tyres Work
Run-flat tyres feature a reinforced sidewall construction that allows the tyre to continue supporting the vehicle's weight even after losing all air pressure. This gives you the ability to drive for a limited distance — typically up to 50 miles at no more than 50 mph — after a puncture, giving you time to reach a safe location or tyre centre without having to stop at the roadside.
Because run-flat tyres maintain their structure when deflated, vehicles fitted with them are typically supplied without a spare tyre, freeing up boot space. They are standard equipment on many BMW, MINI, and Mercedes models.
The Trade-Offs of Run-Flat Tyres
The reinforced sidewall that makes run-flat tyres useful after a puncture also makes them stiffer, which results in a firmer ride compared to standard tyres on the same vehicle. Some drivers find this difference noticeable on longer journeys or on poorer road surfaces.
Crucially, run-flat tyres that have been driven on while deflated — even within the manufacturer's recommended limits — cannot typically be repaired. They must be replaced. This means the cost of a puncture incident on run-flat tyres is higher than on standard tyres, where a straightforward repair is often possible.
Which Type Is Right for Your Vehicle?
If your vehicle was designed around run-flat tyres — as is the case with many BMW and MINI models without a spare wheel provision — then staying with run-flat tyres is the safest and most practical choice. Switching to standard tyres on such vehicles requires the addition of a spare wheel, tyre pressure monitoring system adjustments, and potentially suspension recalibration.
For vehicles that were not originally specified with run-flats, standard tyres remain the most cost-effective and comfortable option. Triumph Mobile Tyres carries both types and can advise on the correct specification for your vehicle during booking.
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