What does the designation “TWI” (Tread Wear Indicator) mean?

The designation "TWI" stands for Tread Wear Indicator. It shows how much tread is left on a tire and helps determine when a tire should be replaced for safety. These indicators are small raised areas that sit in the main grooves of the tire. When the tread wears down to these marks, the tire has reached the minimum allowed tread depth (1.6 mm in Germany). Driving with worn tires can be dangerous, especially in wet conditions. The other options about recut profiles or tubeless tires are not related to “TWI.” Remember, regularly checking your tires’ tread with TWI helps you stay safe and legal on the roads.