Multiple choice general knowledge science & technology

------ are raised features located at the bottom of the tread grooves that indicate the tire has reached its wear limit

  1. Tire

  2. Tube

  3. Wear bar

  4. Wear meter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wear bars (also called wear indicators) are small raised ridges in the tread grooves that become visible when tread depth reaches the legal minimum (typically 2/32 inch). When these are flush with the tread surface, the tire must be replaced. 'Tire' and 'Tube' are components, not indicators. 'Wear meter' is not the correct term.

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