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Ask a Trooper: Important for motorists to monitor tire wear

Questions concerning traffic-related laws or issues in Minnesota may be sent to Minnesota State Patrol Sgt. Jesse Grabow at 1000 Highway 10 W., Detroit Lakes, MN 56560. You can follow him on Twitter @MSPPIO_NW or email him at jesse.grabow@state.mn.us

Close-up of Minnesota State Patrol trooper's squad vehicle
Contributed

Question: I enjoyed your article about wheel bearings on trailers. Could you talk more about tire safety? I look around in parking lots and see many tires that are unsafe. Thanks!

Answer: This is certainly a good topic. Tire talk is an important conversation as their main functions include supporting the vehicle load, transmitting traction and braking forces to the road surface, absorbing road shocks, and changing and maintaining the direction of travel.

To ensure these functions are being adequately met, there are some important things to inspect on each of your vehicle’s tires on a regular basis:

  • Tread depth of your tires.
  • The air pressure. Check tire pressure with a tire gauge. Tires can be as much as 50 percent under-inflated before it is visibly noticeable.
  • The wear or any damage or signs of deterioration. Tread or sidewall cracks, cuts or snags deep enough to expose the body cords.

Tread depth is essential to a well-performing tire. Water accumulates on the road during wet conditions. Tires need tread for better traction during these harsh conditions. The grooves on your tires work to siphon water away from the surface of the tires when the road is wet.

Tire Penny.jpg
Tires with a tread depth of one-sixteenth of an inch or less are unsafe. Place a penny head first into the tread grooves nearest the center of the tire at three locations equally spaced around the circumference of the tire. If you see the top of Lincoln’s head, you need new tires. (Courtesy of Minnesota State Patrol)

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  • Checking the tire tread depth. Tires with a tread depth of one-sixteenth of an inch or less are unsafe. Place a penny head first into the tread grooves nearest the center of the tire at three locations equally spaced around the circumference of the tire. If you see the top of Lincoln’s head, you need new tires.
  • Tire Wear Bar.jpg
    Tread wear indicators (wear bars) are located at the base of the main grooves and are equally spaced around the tire. The tread wear indicators which look like narrow strips of smooth rubber across the tread, will appear on the tire when the point of wear is reached. When you get to this point, you need new tires. (Courtesy of Minnesota State Patrol)

  • Tread wear indicators (wear bars) are located at the base of the main grooves and are equally spaced around the tire. The tread wear indicators which look like narrow strips of smooth rubber across the tread, will appear on the tire when the point of wear is reached. When you get to this point, you need new tires.

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