The load index is a numerical code stamped on every commercial vehicle tyre that indicates the maximum weight the tyre can safely carry at its rated inflation pressure. Understanding and correctly applying load index information is not simply a technical consideration — it is a legal requirement for every UK commercial vehicle operator.
Each load index number corresponds to a specific maximum load capacity in kilograms. For example, a tyre with a load index of 145 is rated to carry 2,900 kg. On a dual-wheel axle, the load index of each individual tyre must be appropriate for its share of the total axle load when the vehicle is at its maximum operating weight. Fitting under-rated tyres to a loaded axle is both illegal and dangerous.
A tyre operating consistently beyond its rated capacity runs at elevated internal temperatures, is more susceptible to structural failure, and wears at an accelerated rate. DVSA examiners check tyre specifications against vehicle weights during roadside inspections, and vehicles found to have under-rated tyres fitted are subject to prohibition until compliant tyres are installed.
When sourcing replacement tyres for any commercial vehicle, always confirm the correct load index and speed rating with a qualified tyre specialist before purchase. A reputable mobile tyre fitting service will verify these specifications against the vehicle's plated weight before supplying any tyre, ensuring that every fitment is fully compliant and appropriate for the vehicle's actual operating conditions.
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