How to Measure Tire Tread Depth Accurately
Maintaining sufficient tread depth is one of the most vital road safety factors. Below are the three primary methods used globally to inspect tire condition, from physical tools to optical AI computer vision.
1. Built-in Tread Wear Indicators (TWI)
All modern tires manufactured globally feature Tread Wear Indicator (TWI) bars molded into the main longitudinal grooves. These small rubber bridges are raised exactly 1.6 mm above the groove base. When your tire tread wears down flush with these bars, the tire has reached its legal safety limit.
2. Mechanical & Digital Depth Gauges
Physical depth gauges use a sliding probe inserted directly into the tread groove. While accurate at a single spot, manual gauges require physical access, clean hands, and multiple measurements across the inner, center, and outer tread zones to detect uneven wear.
3. Optical AI Scanning (TyreCam Vision)
Optical AI analysis uses deep learning computer vision to evaluate tire photos directly in your web browser. The system analyzes groove shadow depths, surface micro-textures, and TWI markers simultaneously across the entire visible surface.
- Contactless inspection from any smartphone photo
- Instant millimeter estimation and safety status
- Generates downloadable PDF diagnostic reports for records