Safety · Expert tip
Test tread depth with a coin
The coin test quickly shows if tread is near the limit.
The expert tip
- Insert a coin in the groove; if the top is visible, replace
- Legal minimum is 1.6 mm; replace sooner for safety
- Uneven wear = alignment or pressure problem
Source: Tire safety experts
Apply tips that match your car and manual. For anything safety-critical or high-voltage, use a qualified mechanic.