Tread Depth Checker
Enter your current tread depth to see if your tires are safe, borderline, or need immediate replacement — plus an estimate of miles remaining.
Tread Depth Safety Scale
The Penny & Quarter Test
Penny Test — 2/32"
Insert a penny into the tread groove with Lincoln's head pointing down. If you can see the top of Lincoln's head, your tires are at or below 2/32" and need immediate replacement.
Result: Replace now.
Quarter Test — 4/32"
Insert a quarter with Washington's head pointing down. If you can see the top of Washington's head, your tires are below 4/32". They're still legal but wet weather performance is compromised.
Result: Start shopping.
FAQ
When should I replace my tires?
Replace your tires when tread depth reaches 2/32" (1.6mm) — this is the legal minimum in most US states. For wet and winter driving safety, experts recommend replacing at 4/32" (3.2mm) because hydroplaning resistance drops significantly below that point.
How do I measure tread depth without a gauge?
Use the penny test: insert a penny into the tread groove with Lincoln's head pointing down. If you can see all of Lincoln's head, your tread is at 2/32" or less and tires need immediate replacement. Use a quarter for the 4/32" check — if you can see the top of Washington's head, it's time to start shopping.
What is the tread depth on new tires?
Most new passenger tires start with 10/32" to 11/32" (about 8-9mm) of tread. Performance summer tires may start at 8/32" (6.4mm). Light truck and SUV tires often start at 11/32" to 16/32".
Does tread depth affect stopping distance?
Yes, dramatically. A tire at 2/32" can take up to 500 feet to stop from 70 mph in wet conditions — more than twice the distance of a new tire. At 4/32", wet stopping distances are already significantly longer than at 10/32".
Is it OK to replace just two tires?
For FWD or RWD vehicles, replacing in pairs (both fronts or both rears) is acceptable. Always put the new tires on the rear axle regardless of drive type — this helps prevent oversteer and loss of control in emergencies. For AWD/4WD vehicles, replace all four to protect the drivetrain.