Tyres become the latest target for vehicle efficiency regulations

California has approved new regulations requiring replacement tyres sold in the US state to meet new energy-efficiency standards designed to close the gap with tyres fitted to new vehicles.

The regulations are the first of their kind in the US and were approved by the California Energy Commission this month, ahead of a two-stage introduction beginning in 2029 and reaching its second phase in 2033.

Rather than requiring each replacement tyre to match the rolling resistance of the original tyre fitted to a particular vehicle, the regulations are designed to ensure replacement tyres sold in California are at least as energy efficient, on average, as tyres supplied as original equipment on new passenger cars and light-duty trucks in the state.

Rolling resistance is the energy lost as a tyre rolls along the road, with higher rolling resistance increasing the amount of petrol, diesel, electricity or hydrogen required to move a vehicle.

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The California Energy Commission says original-equipment tyres are typically more efficient than replacement tyres, meaning a vehicle’s fuel consumption or electric driving range can worsen when its factory tyres are replaced.

The Californian regulations go further than European rules introduced from 2012, which set maximum rolling-resistance limits for tyres but don't require the replacement-tyre market to achieve the average efficiency of tyres fitted to new vehicles.

Industry groups, The New York Times reported, have opposed the move, suggesting motorists could pay an additional US$13 (A$18) per tyre as a result of the new regulations.

The California Energy Commission estimates higher tyre costs will be more than offset by reduced fuel consumption.

Under the second phase of the regulations, it estimates a petrol-powered passenger car or SUV will save around US$179 (A$252) over the typical four-year life of a set of tyres, while the additional cost of compliant tyres is estimated at US$6.50 (A$9.13) per tyre, or US$26 (A$36.50) per set.

The United States Tire Manufacturers Association (USTMA) forecasts around 278 million replacement tyres will be sold in the US in 2026, while California government modelling indicates upwards of 42.1 million replacement tyres will be sold in the state in 2028.

For comparison, around 24.5 million passenger-car and light-commercial vehicle replacement tyres were sold in Australia in 2025, according to Automotive Insights .

Despite the regulations outlining compliance testing of tyres, USTMA executive vice-president Tracey Norberg has criticised the move.

Ms Norberg said enforcement would be difficult, potentially allowing motorists to buy cheaper, non-compliant tyres from other US states and disadvantaging Californian tyre businesses.