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PSI difference

Discussion in 'Wheels & Tires' started by Sweet_nasty87, May 9, 2015.

  1. May 9, 2015 at 7:17 AM
    #1
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    Heading to Houston and my TPMS lit up stopped and checked 40 up front 50 in the back. I know the heat maxes them expand but it hasn't been 50 miles even. Any suggestions
     
  2. May 9, 2015 at 7:39 AM
    #2
    Sean266

    Sean266 #ThinBlueLine Staff Member

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    Did you check your spare? Sometimes they place TPMS sensors in those...
     
  3. May 9, 2015 at 7:44 AM
    #3
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    No I didn't check but tire specs say 30 front 33 back...worried now
     
  4. May 9, 2015 at 8:00 AM
    #4
    Sean266

    Sean266 #ThinBlueLine Staff Member

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    Ya maybe stock tires...off road tires you nee more.
    Check the spare...worse comes to worse, can you go to DT or some other tire shop to check for a small pinhole?
     
  5. May 9, 2015 at 10:40 AM
    #5
    14burrito

    14burrito New Member

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    Psi is psi - tire size makes no difference. 35psi in a 31" is still 35psi in a 40" while the volume of air is different.

    LT vs P rated tires now is what you need to look at. LT tires typically have a higher psi rating needed, but this is all load dependant so you will need to reference the tire mfg specs.

    Tpms sensors don't know what kind of tire you have, its simply taking a reading and throwing a light due to pressure differences. Sounds like maybe that 10psi difference front to back may be the issue? Based off an OEM calibrated difference of 3psi front to back, sees a difference of 10psi and is confused. Not sure how long you have been driving with that high of a difference.
     
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  6. May 11, 2015 at 9:13 AM
    #6
    chphilo

    chphilo New Member

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    I started a poll at TT regarding the psi people are running with e-rated tires (80 psi max). The most common value seems to be 45 front and rear.

    This is the confusing part: I purchased Nitto Trail Grappler from Discount Tire. They recommended 35 psi front and rear. A reputable local shop recommended 65 psi front and rear. To add to the confusion, I contacted Nitto and they recommended 38 psi in front and 40 psi in the rear. Currently I am running 50 psi front and rear (I was worried about severe dip in temperature this past winter), but am planning to go with 45 front and rear pretty soon. I tend trust the collective experience of Tundra enthusiasts over other recommendations.
     
  7. May 11, 2015 at 9:19 AM
    #7
    matluth

    matluth Fish On!

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    LT275/70/R18's ...........Non tow: 51psi, heavy tow (rarely)
    My Niito M/T' LT275/70/R18's Non tow 51 psi, The rare heavy long haul tow:75psi all the way around. Tire wear has been even. 35 way too low for E with these tires.
     
  8. May 11, 2015 at 9:51 AM
    #8
    Sean266

    Sean266 #ThinBlueLine Staff Member

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    I would run 40 front/rear or 45/40....65 is way too high and your tires will suffer.
     
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  9. May 11, 2015 at 10:13 AM
    #9
    matluth

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    A quick test is to look at your tread print on a wet surface like concrete or hard sand to check for over/under inflation. When I got my truck, the tires were at 40 psi all the way around and very noisy. Just didn't feel right when cornering too, so I bumped them up to 50 psi and they ride and sound much better. At least in my case. The tread pattern was even on test print check. http://freeasestudyguides.com/tire-wear-patterns.html
     
    Last edited: May 11, 2015
  10. May 11, 2015 at 12:19 PM
    #10
    Mike

    Mike Tread lightly.

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    yep bank account is running low from it..
    I agree plus higher the psi in the tire the smaller the patch is on the road for traction that in turn can lead to problems with your tires cupping or wearing out faster and or very little traction in wet or snow.
     
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  11. May 12, 2015 at 7:51 AM
    #11
    matluth

    matluth Fish On!

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    I went out and double checked my tires. The rears are at approx 44 and the front are approx 46. They were at 40 when I got my truck a year ago. I don't know why I thought I put 50 psi. Old fart memory loss.
     
  12. May 14, 2015 at 5:31 PM
    #12
    mdavis

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    Im running 44 in the rear and 41 in the front on my new Toyo AT2's. Thinking about bumping them up because Im seeing the middle a little lower than the outside (concave) when looking at top of the tire. I would have thought 40 psi would be more than enough. Maybe Im just being paranoid.
     
  13. May 14, 2015 at 5:39 PM
    #13
    14burrito

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    If your wearing the middle of the tread quicker your over inflated.
     
  14. May 14, 2015 at 5:42 PM
    #14
    mdavis

    mdavis Tiger Life

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    ^^ Brand new tires. Just installed yesterday. In the case I described, I would be wearing the outer part first.
     
  15. May 14, 2015 at 6:03 PM
    #15
    matluth

    matluth Fish On!

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    Your'e heavier up front. Try them at 45 or so and see how that goes.
     
  16. May 14, 2015 at 6:38 PM
    #16
    14burrito

    14burrito New Member

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    Can you please explain how being under inflated wears the inside quicker?

    Screenshot_2015-05-14-18-37-15.jpg



    Nvm I see what your saying. You dont see tire wear you simply see the tire itself concave.
     
    Last edited: May 14, 2015
  17. May 14, 2015 at 6:56 PM
    #17
    matluth

    matluth Fish On!

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    If for example the tread print is not even with less imprint in the middle of the tread print, then tire is under inflated. Sides wear quicker in this situation. If the center of the tread was imprinted and the sides were not, then over inflated. I think mdavis was describing the former. Less tread in the center not totally in contact with the ground so to speak.
     
  18. May 14, 2015 at 7:00 PM
    #18
    14burrito

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    Yeah i edited the post above, I see what he is saying.
     
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  19. May 14, 2015 at 7:06 PM
    #19
    matluth

    matluth Fish On!

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    Sorry I missed that. I am trying to watch the new show "Wayward Pines" at the same time.
     
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  20. May 16, 2015 at 1:50 PM
    #20
    tat2ude39

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    When I upgraded my tires to a more aggressive off road tire, Discount Tires put mine at 40psi. I haven't noticed a difference from the 30/33 stock suggestions, and ride is still great. No problems on or off road.
     
  21. May 16, 2015 at 2:15 PM
    #21
    matluth

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    My TPMS light just came on coming back from the store. Probably because of 40/45 rear/front psi difference. Raining too hard now to bother with it. Probably set them all to 40.
     
  22. May 18, 2015 at 8:19 PM
    #22
    csuviper

    csuviper Moderator Staff Member

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    You can reset the tpms by holding the little button under the dash.
     
  23. May 18, 2015 at 8:21 PM
    #23
    csuviper

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  24. May 19, 2015 at 6:48 AM
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    matluth

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  25. May 19, 2015 at 6:55 AM
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    mdavis

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    I know why... When I changed my wheels and tires last week the stealership got me for $310 for the sensors and $118 to program them. I was in shock! :annoyed:
     
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  26. May 19, 2015 at 7:12 AM
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    matluth

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    Dammnnn. Heck that's the cost of a decent tire/rim combo, or Vegas (nickel slots), a lot of beer.:headbang:
     
  27. May 19, 2015 at 5:49 PM
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    csuviper

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  28. May 20, 2015 at 7:52 AM
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    matluth

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