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SESK: Stuff Everyone Should Know · sesk.info/dad-tread-depth-2-32

At what tread depth does NHTSA say tires are unsafe and should be replaced?

2/32 of an inch.

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  1. 1/8 of an inch
  2. 2/32 of an inch ✔
  3. 1/2 of an inch

Why: NHTSA says tires are not safe and should be replaced when tread is worn down to 2/32 of an inch. Use a tread gauge or the penny test to check. Worn tires grip wet roads poorly.

Huh, didn't know that: The penny test is built on the same 2/32 inch line: Lincoln's head visible means it is time.

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References

Answer: 2/32 of an inch. NHTSA says tires are not safe and should be replaced when tread is worn down to 2/32 of an inch. Use a tread gauge or the penny test to check. Worn tires grip wet roads poorly.

  1. NHTSA: Tires www.nhtsa.gov/vehicle-safety/tires
    Tires are not safe and should be replaced when the tread is worn down to 2/32 of an inch.
    Checked 2026-10-10.

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