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Car Parts

Tires

Good to go

6–14 mm

Full tread depth, tire is performing as designed.

Replace soon

3–5 mm

Tread is wearing down, plan to replace in the next few months.

Immediate change required

1.6–2 mm

At or below legal minimum, replace immediately.

Check at least 3 different spots across each tire — uneven wear means alignment or suspension issues, not just normal wear.

Tread wear indicator bars are small raised bars built into the tread grooves of every tire. When the tread is flush with these bars, replace immediately.

Quarter Test

Quarter test: three panels showing a quarter inserted into a tire tread groove. Left: deep tread covers most of Washington's head (good). Middle: medium tread covers half the head (replace soon). Right: shallow tread shows the whole head (replace now).
Good to goReplace soonReplace now

Insert a quarter into the tread groove. The more of Washington's head you can see, the sooner the tire needs replacing.