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When Are Your Tires Worn Out?

Posted March 19, 2017 5:34 AM


 

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

While there may be legal requirements for the Willoughby 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".

Lakeside Certified Auto
38525 Lakeshore Blvd
Willoughby, OH 44094
(440) 946-0076
http://www.lakesidecertifiedauto.com

 



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What People Say About Us

  • reviewicon
    , 03/05/2024

    Good honest folks! Very pleasant and very informative and VERY helpful!

  • reviewicon
    , 01/07/2024

    Awesome shop. Had work done on my 2016 KIA a few times and the work was exemplary and the cost was reasonable. I highly recommend!

  • reviewiconTires, near Willoughby, OH
    , 12/11/2023

    Great service! Very conscientious and highly communicative with car owner. Had tires replace at 71K miles. Tech called about needing rear brakes and rotors. Provided cost and I immediately approved. Picked up SUV a little later. These are great technicians and very honest. I highly recommend and will be back.

  • reviewiconTires, near Willoughby, OH
    , 12/13/2023

    I been having my car worked on there for quite a few years now. My son's child hood friend work there. He a 5 star mechanic. The business there is top notch. The price is very good. I come all the way from the Westside of Cleveland to Willoughby Ohio because it's hard to find a good mechanic shop.

  • reviewicon
    , 11/30/2023

    This was my first visit to this neighborhood business and we were very impressed. They checked my concerns, found nothing wrong, and we weren't charged. What I needed would have required a fair amount of time and effort ... no charge! We will definitely return for any service needs for our 2 cars. Thank you Lakeside Auto.

  • reviewicon
    , 11/18/2023

    Used to live nearby, moved 30 miles east and still make the trip because of fair prices and honest service I trust.

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