Back to all

When Are Your Tires Worn Out?

April 30, 2018


 

Hey Homer Glen area drivers, are your tires worn out? What is the standard for our Illinois streets? How can you tell on your vehicle?

While there may be legal requirements for the Homer Glen area, there are safety concerns that go beyond meeting minimum replacement mandates.

Two-thirty-seconds of an inch is the depth of the tire tread wear indicator bars that US law has required to be molded across all tires since August 1, 1968. When tires are worn so that this bar is visible, there's just 2/32 of an inch – 1.6 millimeters – of tread left. It's that level of wear that's been called into question recently.

We're referring to the tread depth on a tire, it can't move surface water out of the way and you start to hydroplane.

In a safety study, a section of a test track was flooded with a thin layer of water. If you laid a dime on the track, the water would be deep enough to surround the coin, but not enough to cover it.

A car and a full-sized pick-up accelerated to 70 miles per hour, or 112 kilometers an hour, and then made a hard stop in the wet test area. Stopping distance and time were measured for three different tire depths:

  • New tire tread depth
  • 4/32 of an inch, or 3.2 mm
  • 2/32 of an inch, or 1.6 mm

So what happened with the 2/32 inch/1.6 mm tires on the car? Get this – when the car had traveled the distance required to stop with new tires, it was still going 55 mph/89 kph. Stopping distance was nearly doubled to 379 feet/116 meters, and it took 5.9 seconds.

Wow! That means if you barely have room to stop with new tires, you would hit the car in front of you at 55 mph/89 kph with the worn tires.

Now, with the partially worn tires – at 4/32 of an inch, or 3.2 mm – the car was still going at 45 mph/72 kph at the point where new tires brought the car to a halt. It took nearly 100 feet, or about 30 meters, more room to stop and 1.2 seconds longer. That's a big improvement. We can see why Consumer Reports and others are calling for a new standard.

Of course, stopping distances were greater for the heavier pick-up truck.

How do you know when your tires are at 4/32 inch or 3.2 mm? Easy; just insert an American quarter into the tread. Put it in upside down. If the tread doesn't cover George Washington's hairline, it's time to replace your tires. With a Canadian quarter, the tread should cover the numbers in the year stamp.

You may remember doing that with pennies. A penny gives you 2/32 inch, or 1.6 mm, to Abraham Lincoln's head. The quarter is the new recommendation – 4/32 inch, or 3.2 mm.

How do people feel about replacing their tires earlier? Well, tires are a big ticket item and most people want to get the most wear out of them that they can. But do you want that much more risk just to run your tires until they are legally worn out?

For us, and we would guess for many, the answer is "no".

Tuffy Tire & Auto Service Homer Glen
15743 S Bell Rd
Homer Glen, Illinois 60491
708-301-8885

 

More articles from Tuffy Homer Glen

Feeling Powerless (Why Is My Battery Light On?)

March 24, 2024

When one of your vehicles warning lights comes on, the first thing that comes to mind is, Oh, no, whats wrong now? When its the battery light, it means theres something wrong with your vehicles battery or charging system. And because both are important for your vehicle to work properly, its a go... More

What is a TPS? (Throttle Position Sensor)

March 17, 2024

You know you have an accelerator pedal; step on it and your vehicle is supposed to go. But did you know there is a part in your vehicle that keeps track of where the throttle is? It's called the Throttle Position Sensor, or TPS. The TPS is a sensor that helps your vehicle figure out the right mi... More

Ready, Set, COLD! (Getting Vehicle Ready for Winter)

March 10, 2024

When the temperatures plunge, your vehicle better be ready because it faces a whole new set of challenges. Rubber stiffens, glass fogs, fluids freeze. Just thinking about it can get your heart beating faster. So here are some tips for getting ready for those inevitable colder temperatures. Mak... More