California adopts new tire efficiency standards, limiting low-rolling-resistance models

The California Energy Commission voted unanimously to adopt a rule that will restrict the sale of replacement tires that fail to meet new rolling-resistance standards. The regulation, aimed at improving fuel and electricity efficiency, will be implemented in two stages: the first phase, beginning in 2029, caps rolling resistance at 9.1, and a second phase in 2033 tightens the limit to 7.2. The commission said testing of 537 tire types informed the thresholds.

Commissioner Nancy Skinner said the measure is intended to save drivers money by ensuring replacement tires are as efficient as the original equipment tires. The commission estimates average savings of $79 within four months under phase one and $153 within seven months after phase two takes effect.

Industry representatives expressed concerns about cost and enforcement. > "The rule will drive up costs for consumers and could increase tire prices far beyond the commission's estimate of $6.50 per tire," said Bret Gladfelty of Goodyear, adding that the rule could eliminate about 70% of tires currently sold in the state by 2033. Other manufacturers, including Bridgestone and Michelin, questioned how the standard would be applied and whether it might favor larger companies.

The rule excludes certain categories such as snow tires, motorcycle tires, off-road and ATV tires, spare tires, and competition tires. It stems from a 2003 law that required the commission to study tire-efficiency regulation, a process that took more than two decades before adoption.

The policy is the first of its kind in the United States, and other states are expected to monitor its impact on consumer choice and fuel savings as the rollout proceeds.