California Isn’t Banning Performance Tires—But It Could Limit What Aftermarket Rubber You Buy

California is pushing a new rule that would require replacement tires sold in the state to match the average energy efficiency of original-equipment (OE) tires. Despite viral claims, the proposal does not outright ban performance tires, but it does create separate efficiency standards for ultra-high-performance rubber. The regulation stems from a 2003 California law mandating a replacement tire program to reduce rolling resistance, which increases fuel consumption and emissions. Regulators argue the move could cut costs at the pump and lower emissions, though critics warn it could shrink consumer choice. The proposal targets tire manufacturers and retailers, not drivers—meaning you could still install any tire on your car, but if it’s not sold in California, you’d have to source it out of state. Industry watchers fear manufacturers may drop certain tire lines entirely if California’s market becomes too restrictive, potentially affecting buyers nationwide. The debate pits fuel-saving policy against enthusiast freedoms, with the outcome hinging on rules still under development after more than two decades of legal groundwork.