04-28-2026, 07:32 AM
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#1 (permalink)
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Tire Geek
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California’s proposed new tire regulations
On Friday, April 24, 2026, the California Energy Commission issued its proposed new tire regulations for tires sold in California. The new regulations would require passenger car and light truck tires to meet a maximum rolling resistance level which varies by tire category in 2 phases. The first phase is slated for January 1, 2028, and the second phase on January 1, 2031. The new regulations include a minimum wet grip level.
In addition to the tire requirements, tire manufacturers (or brand name owners) would be required to submit data to the CEC on all tires that meet the regulations. Data would include rolling resistance, wet grip level, and enough information to uniquely identify the tire. A database is planned to be available to the public.
I go into detail here:
Barry's Tire Tech: California’s Proposed Replacement Tire Efficiency Program – April, 2026
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 Today
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Other popular topics in this forum...
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04-28-2026, 11:42 AM
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#2 (permalink)
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Human Environmentalist
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I normally hate this kind of thing, but then there should be a DB of tire specs people can reference.
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05-13-2026, 07:36 AM
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#3 (permalink)
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Tire Geek
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Update: Notice of Public Hearing
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05-15-2026, 01:39 AM
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#4 (permalink)
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Human Environmentalist
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What if you say no?
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05-15-2026, 05:50 AM
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#5 (permalink)
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Tire Geek
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Quote:
Originally Posted by redpoint5
What if you say no?
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Flippant answer: They will ignore you. You're from Oregon! |
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05-16-2026, 04:49 PM
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#6 (permalink)
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High Altitude Hybrid
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But I'm in Colorado, and Colorado always adopts all of California's EPA rules.
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08-03-2026, 04:09 PM
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#7 (permalink)
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EcoModding Apprentice
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Ezcape - '15 Ford Escape Titanium 90 day: 22.72 mpg (US)
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Interesting, but no slip coefficient?
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"The Stone Age did not come to an end because we had a lack of stones, and the oil age will not come to an end because we have a lack of oil" ; His Excellency Sheikh Ahmed Zaki Yamani (Saudi Arabia Oil Minister from 1962 to 1986)
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08-03-2026, 05:08 PM
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#8 (permalink)
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Master EcoModder
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Quote:
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Originally Posted by DDG Search Assist
California's Proposed Replacement Tire Efficiency Program does not explicitly mention bias ply cheater slicks in the provided snippets...
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The problem with politicians is they're too busy counting their ill-gotten gains to consider all the edge cases. Worse than useless.
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..Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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..Now for the ball scores: 4 to 3, 6 to 2 and 8 to 1 -- Firesign Theater
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08-04-2026, 07:05 AM
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#9 (permalink)
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Tire Geek
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There is an update:
Phase 1 implementation postponed from January 1, 2028 to January 1, 2029
Phase 2 implementation postponed from January 1, 2031 to January 1, 2033
13" tires are now exempt.
It was clarified that the implementation dates apply to date of production!
All Season Winter tires (aka All Weather tires) are now exempt.
Competition tires are now exempt.
Changed the definition of a "Long Life" tires from 1,000 UTQG test score to 800.
Changed the definition of a "Ultra Long Life" tires from 1,400 UTQG test score to 1,000.
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08-04-2026, 12:44 PM
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#10 (permalink)
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Master EcoModder
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This seems relevant.
Long story short; 21>20" rims with different tires gives 25-37% more range.
I looked into the 145-15 size I need for the front of the Superbeetle. Kumho offers three all season tires in that size, (Crugen GT Pro, Ecsta 4X II (KU22) and Solus HA32). I like the look of the 165/50-15s but suspect they have more rolling resistance.
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..Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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..Now for the ball scores: 4 to 3, 6 to 2 and 8 to 1 -- Firesign Theater
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