# California tire efficiency regulation

> Live situation record from CLSTR: https://clstr.news/situations/california-tire-efficiency-regulation
> Updated: 2026-07-28T14:30:00.000Z. Sources: 2. Developments: 2.

In early July 2026 California announced a proposal to tighten standards for replacement tires, aiming to boost vehicle fuel efficiency and cut emissions. By late July, the California Energy Commission released a revised draft after a public comment period. The update introduced exemptions for a wider array of tires—including all‑season snowflake‑rated tires, certain competition, run‑flat, off‑road, and ultra‑long‑life models—while also postponing implementation dates. Phase 1 now applies to tires built from January 1 2029 (instead of 2028), and Phase 2 is shifted to January 1 2033. The commission will consider adopting the rules after the comment deadline on August 3.

## Timeline

### 2026-07-28: California Energy Commission Revises Replacement Tire Efficiency Rules

California Energy Commission updated its replacement‑tire efficiency proposal, adding exemptions for competition, off‑road and ultra‑long‑life tires and moving Phase 1 to 2029, with comments open until Aug 3.

2 sources. https://clstr.news/cluster/california-energy-commission-revises-replacement-tire-efficiency-rules

### 2026-07-07: California proposes stricter standards for replacement tires to reduce vehicle energy use

California is considering a rule that replacement tires must match original‑equipment efficiency standards, seeking lower vehicle energy use but possibly increasing tire costs.

2 sources. https://clstr.news/cluster/california-proposes-stricter-standards-for-replacement-tires-to-reduce-vehicle-energy-use

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Cite as: California tire efficiency regulation. CLSTR, https://clstr.news/situations/california-tire-efficiency-regulation