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SUBJECT: # 13243: Tire Store Says To Put In 65 psi in truck tires

Submitted by Ontheroadagain ( from MINNESOTA on 12/23/2008 1:08:00 AM

The front tire on my Silverado truck was low today so I went to downtown to the tire shop.

Anyway, the kid brings the air hose out from inside the garage and proceeds to fill up my low front tire. Then he says to me .... "Your tires are rated for 80 psi so you should put more air in them than you have."

I said, "Ya, but the side panel of my door says I should inflate them to 35 psi."

But the kid says, these aren't the original tires. And he is right. I put BF Goodrich All Terrain snow tires on my Silverado 4 x 4.

Anyway, he filled all four tires up to 65 psi and said that is what they do with all their tires rated for high psi when they put them on 1/2 tons etc.

Is this right? Has anyone heard of this before????????

  1. 12/23/2008 8:57:00 AM Submitted by MikeF from FL says load rating
    What is the load rating of the tire versus what the vehicle requires?

  2. 12/23/2008 11:37:00 AM Submitted by Toonafish from GA says he's right...
    I hope you tipped him...


  3. 12/23/2008 10:42:00 PM Submitted by Brannen #10664 from FL says Should say
    right on the side of the tire. Look for the load rating. It should end with " XX psi cold" If they are load range E then yes, 80 psi.

  4. 12/23/2008 10:49:00 PM Submitted by Alex from GA #10518 from GA says Load range.
    E-80 lbs D-65 lbs C-50 lbs B-35 lbs. These are maximum pressures. What is the load range of your tires?

  5. 12/24/2008 8:40:00 AM Submitted by MikeF from FL says yes but
    I will agree that an E tire requires 65 to 80#. My point was if your truck doesn't need E's then having them on and aired up will do nothing to increase the load capabilities of your truck. If you put on a higher rated tire you can still use the same pressure as required on the stock tire to get the required rating for your truck. There is no benefit to putting on higher load rated tires with high air pressure on a stock vehicle except maybe to your dentist.

  6. 12/25/2008 6:15:00 AM Submitted by dsailer from FL says PSI - Serious subject
    Just shows you how tough the times are. A kid wth a degree in Automotive Engineering, working in a tire shop.

    I always have this debate when I have my truck serviced. they pump the tires to the max. I'm convinced they only have to remember one number, this way.

    since tire failures are responsible for so many fatal crashes, I check the tires myself. Not trusting my life to the kid at the tire store

  7. 12/27/2008 5:28:00 PM Submitted by John_M #10981 from NY says Tire inflation pressures
    The driver's door on my '96 Chevy C2500 has a factory sticker indicating the correct tire for my truck is a 245-75R 16 Load range E. These tires (load range E) are rated for a maximum inflation pressure of 80 psi.

    The factory says I should inflate to 40 psi in front and 60 psi in rear. I always keep the front at 40 psi. I usually run 50 psi in the rear for most tasks because the truck rides and handles better with the reduced rear pressure when I am not carrying a maximumm load. I will run 60 psi in the rear when I am towing and when I am carrying a heavy load in the bed.

    Another comment: I would suggest a person have at least two tire gauges and continually test them for consistent readings. My experience has been that in most cases (that is right; most cases) when my truck tires have been given the "correct" inflation pressure at a garage or dealership the tires can have a variation of 5-10 psi side-to-side and front to rear. Either the technician doing the inflation is using a very inconsistent or inaccurate gauge or he/she does not know how to read the gauge or he/she is not placing the gauge properly on the valve stem. Take your choice.

    Happy new year and good health to all!


  8. 12/28/2008 8:16:00 PM Submitted by Edloe from TX says Everyone is right (and wrong)
    You should almost always run the tires rated for which your vehicle and inflate according to the manual or door sticker. The exception being when you alter the other suspension parts to increase the weight load factors.

    If you "step up" to a higher rating, you will have to run them over inflated for your vehicle or under inflated for your tires.

    Running them under inflated (ie, 40 psi on tire rated for 60-80 psi) they wil wear prematurely along the edges and may cause the tires to overheat and blow out. Ford learned this the hard way in the Firestone/Explorer debacle.

    If you over inflate them significantly beyond the vehicle rating, you change the handling dynamics of the vehicle. Another lesson Ford learned. Of coures they already knew this and that is why they recommended underflation to begin with. They foolishly believed it cheaper to defend a few law suits rather than redesign the Explorer suspension.

    The reason you get a large load range rating on some tires is for the specific purpose someone pointed out above. Run them at or near bottom of range for normal driving and at or near top for heavy hauling.

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