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Thread: Tires and Safety

  1. #1
    Paper Boy spoolinupblue is on a distinguished road spoolinupblue's Avatar
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    May. 19, 2010
    Houston, TX

    Default Tires and Safety

    Wrote this for a Safety Moment at work and thought it would be good to pass it on.

    Most of us operate motor vehicles on a daily basis and hardly ever pay any attention to one of the most vital parts of the vehicle which are our tires.

    Unfortunately, very few of us change this bad habit until it is too late.

    In terms of safety, what we need to know about tires
    Date of manufacturing
    Maximum inflating pressure
    Load Index & Speed Rating
    Temperature resistance, Traction & Treadwear
    Tire Size

    It is very easy to find out what the expiration date is on a tire, if you check on the side of it. You will have a 4 digit number stamped on it. This number indicates the week and the year it was manufactured, the expiration date will be 4 years later.


    In the above pic, 08 means 8th week of the year (February), 06 means Year of manufature 2006


    Different tires are designed for different pressures. You will find your maximum tire inflation pressure on a small number next to the rim on the side of the tire. NEVER EXCEED THIS PRESSURE.

    Max Pressure Acceptable
    32PSI 28PSI
    44PSI 35PSI
    50PSI 44PSI

    In addition, Lower pressure increases tire heat, infared photography of tires tested at high speed damaging heat increases as pressure drops.


    Table below shows the load index and maximum load carrying capacity per tire in pounds and kilograms.


    The speed rating for which a tire is designed is indicated by a letter next to the load index.


    The letters will indicate a tire's resistance to heat. Tires are rated from highest to lowest resistance as A, B or C.


    Traction is a tire's ability to stop on wet pavement. A higher graded tire should allow you to stop your vehicle on a wet road in a shorter distance than a tire with a lower grade. Traction is graded from highest to lowest as "AA", "A", "B", and "C"


    This number will give you the rate at which the tire wears out, the higher the treadwear the longer it should take for the tire to wear out. Hence, a tire graded at 400 should last twice as long as a tire graded at 180.


    "P" = Passenger car tire
    185 = Tire width in millimeters
    75 = Aspect ratio Height to Width of tire. 75% of width in this case
    R = Radial Tire
    14 = 14 inch wheel

    I hope this helps some of you about all that writing on the side of your tires.


    2003 Infiniti G35, 5AT
    1 persons bug is another persons feature.

  2. #2
    i shoot soundmike is on a distinguished road
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    Feb. 9, 2010

    Default Re: Tires and Safety

    Excellent info!

  3. #3

    Default Re: Tires and Safety

    Awesome contribution! This will definitely come in handy for all of us. Thanks a lot!

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