California Adopts New Tire Efficiency Standards
CARB rules set rolling resistance and particle emission limits for tires sold in the state, phasing in over several years.
California has finalized new tire efficiency standards addressing rolling resistance and tire wear particles. The regulations expand state component standards beyond tailpipe emissions to include physical vehicle wear.
What Happened
The California Air Resources Board (CARB) adopted standards requiring tires sold in the state to meet specific limits for rolling resistance and particle emission rates. The rules phase in over several years, allowing manufacturers time to adjust tire compounds and structures. The standards target microplastics released from tire abrasion and tighten rolling resistance requirements to reduce energy drain from vehicles.
Why It Matters
For electric vehicles, lower rolling resistance reduces the energy required to maintain motion, which can increase miles per charge without larger battery packs. California’s market size often leads manufacturers to adopt its rules for nationwide compliance. The regulation addresses tire wear particles, a source of pollution not previously covered in vehicle standards. It also encourages development of tire technologies balancing safety, durability, and efficiency.
The Bottom Line
California’s new tire standards regulate energy efficiency and environmental pollution from tire wear. Manufacturers must adapt products to meet the new rolling resistance and particle emission limits. The rule establishes a framework for addressing non-exhaust vehicle emissions.
