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August 17, 2025 – California has officially adopted the nation’s first efficiency standards for replacement tires, marking a historic step in automotive regulation. The California Energy Commission voted unanimously to implement the Replacement Tire Efficiency Program, which will apply to most passenger car and light-duty truck tires sold in the state starting in 2029.
The new rules target two key performance metrics: rolling resistance and wet grip. Rolling resistance determines how much energy a tire loses as it rotates and flexes against the road surface. Lower rolling resistance means less energy is needed to keep a vehicle moving, which improves fuel economy for gasoline cars and extends range for electric vehicles. The wet grip requirement ensures that efficiency gains do not compromise safety, particularly on wet roads where traction and braking are critical.
The CEC estimates that the standards will eventually save California drivers nearly $1 billion annually in gasoline and electricity costs. The agency also projects a reduction of roughly 2 million metric tons of carbon dioxide emissions each year. On a per-tire basis, the added cost is modest: about $1.50 during the first phase and $6.50 during the second phase. For a typical gasoline vehicle, the later standard could save around $179 in fuel over the lifetime of a set of tires.
The program will be rolled out in two phases. The first efficiency limits apply to tires manufactured on or after January 1, 2029, with stricter requirements taking effect in 2033. Certain specialty categories—including competition tires, winter tires, off-road tires, used tires, retreaded tires, and limited-production models—are exempt from some performance requirements.
Manufacturers and brand owners must report covered tire models to a state database. Any tire subject to the program must meet the applicable standards and reporting obligations before it can be sold or offered for sale in California. This brings retailers as well as manufacturers into the regulatory framework.
The legal foundation for the program dates back to 2003, when California lawmakers passed Assembly Bill 844. That law directed the CEC to create a statewide program aimed at making replacement tires at least as energy efficient, on average, as the original equipment tires installed on new passenger vehicles and light-duty trucks. AB 844 also set boundaries: standards must be technically feasible and cost-effective, while preserving tire safety, average tire life, and the state’s management of discarded tires.
The CEC concluded that available tire technology can meet the new efficiency levels without sacrificing wet grip or tire longevity. The separate wet-grip requirement was designed to ensure that improvements in rolling resistance are paired with an important safety measure.
California’s action follows a long and complicated regulatory history. The CEC paused its earlier tire-efficiency rulemaking in 2012 while the federal government worked on its own program. Congress later directed federal regulators to establish minimum tire performance standards, but that rulemaking was halted in 2017. California restarted its proceeding in 2020.
Federal preemption law creates another important boundary. Congress distinguished between federal rules on tire fuel-efficiency consumer information and state authority to regulate tire fuel efficiency, including testing methods. That provision gives California room to establish performance standards alongside the federal system.
Industry reaction to the final program has been mixed. Michelin supported the efficiency thresholds and the revised 2029 and 2033 schedule. The U.S. Tire Manufacturers Association acknowledged several changes and the later compliance dates but raised concerns about the data supporting some light-truck standards, urging the commission to assess the first phase before imposing stricter requirements. The Specialty Equipment Market Association credited the CEC with making changes to the proposal while arguing that the regulation could increase costs, reduce consumer choice, and affect small businesses. The commission ultimately found that the adopted standards met California’s requirements for feasibility, cost-effectiveness, and safety.
Value-Added Perspective: This regulation is particularly significant for the EV market. With EVs already under pressure to reduce battery costs and extend range, even modest improvements in rolling resistance can translate into meaningful mileage gains. Tire manufacturers are now investing in new rubber compounds and tread designs to meet both the rolling resistance and wet grip thresholds simultaneously—a technical challenge that could spur innovation across the industry. Additionally, the program’s two-phase structure gives manufacturers time to adapt, but the second phase (2033) may push some smaller producers out of the California market due to compliance costs.
The Aug. 17 vote advances the regulations to the next stage of California’s rulemaking process. The commission directed staff to prepare the final regulatory record for submission to the Office of Administrative Law, which reviews state agency regulations for compliance with California’s Administrative Procedure Act. If approved, the regulations will be filed with the Secretary of State, with the first-tier performance standards scheduled to apply in 2029.
