A properly maintained braking system combined with healthy tires is vital for stopping ability. Tread depth directly affects stopping power, especially on wet roads.
When your tires touch the road, they create friction that controls handling and stopping. How much friction you get depends on tire type, road and weather conditions, and how much tread remains. As tread wears down, stopping distances increase—most noticeably in the rain.
Most passenger tires start with about 9–10/32 inch of usable tread; many light truck and winter tires start with more. Those grooves matter because they move water out from under the tire to maintain road contact. As the grooves get shallower, water evacuation drops—and wet stopping distances climb.
Average wet stopping distances increase as tread wears: - Around 11/32 inch: ~160 feet - Around 5/32 inch: ~195 feet - 4/32 inch: ~205 feet - 3/32 inch: ~225 feet - 2/32 inch: ~250 feet
The National Highway Traffic Safety Administration’s 2012 study, Tire-Related Factors in Pre-Crash Phase, found a clear link between low tread depth and increased crash risk. You can read the study summary here: Tire-Related Factors in Pre-Crash Phase.
Note: The Michelin Premier tire lines are designed with technology that helps maintain like‑new wet stopping performance as they wear.
We recommend checking tread depth at least monthly and before long trips. You can do a quick at‑home check with the penny test. Not sure about your results? Stop by—we’ll check for free.
What’s included in a free tire inspection: - Tread depth measurements and wear pattern check - Air pressure check and adjustment to manufacturer specs - Visual inspection for damage, punctures, sidewall issues, and alignment‑related wear
Learn more: Free Tire Inspection
If your tires are approaching 4/32 inch—or you want better wet stopping performance—shop our full selection and compare options that fit your vehicle and budget.
Drive with confidence: healthy tread shortens your stopping distance, especially in the rain. If you’re unsure about your tires, drop by today for a free safety check.