California replacement tire efficiency standards

The California Energy Commission (CEC) has unanimously approved the Replacement Tire Efficiency Program (RTEP), establishing the first state-level efficiency standards for replacement tires in the United States. The regulation targets tires for passenger vehicles and light-duty trucks, focusing on rolling-resistance limits and wet-grip requirements to improve fuel economy and electric vehicle range.

The program will be implemented in two phases: the first for tires manufactured on or after January 1, 2029, and a stricter second phase for those manufactured on or after January 1, 2033. Certain categories, such as motorcycle, off-road, winter, and competition tires, are excluded from the mandate.

The CEC projects the measure will reduce annual CO2 emissions by 2 million metric tons and save drivers approximately $1 billion per year in fuel and electricity costs. To assist consumers, a leaf-scale labeling system will be implemented. While the CEC anticipates incremental consumer costs of $1.50 per tire in Phase 1 and $6.50 in Phase 2, industry representatives have raised concerns. A Goodyear lobbyist stated the regulations were “not ready for adoption,” warning that the mandate could eliminate approximately 70 percent of currently available replacement tires and increase upfront costs.

Industry leaders have intensified their criticism of the policy. Darren Thomas, President and CEO of Dunlop Tires North America, compared the potential for unintended consequences to the state’s high-speed rail project. Critics argue that prioritizing rolling resistance may force manufacturers into design trade-offs that negatively impact traction, wet-weather performance, and tread life. Economic warnings suggest the regulations could add hundreds of dollars to the cost of a full set of tires for consumers.