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What PSI should I run on Xtreme MT2's?

Discussion in 'Wheels & Tires' started by Sweet_nasty87, Jul 6, 2015.

  1. Jul 6, 2015 at 2:17 PM
    #1
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    ProComp stage 1 7in lift, xtreme mt2 35x12.5r20,
    Can someone just tell me what psi should i be running on a set of procomp xtreme MT2? cant find actual numbers
    These are 35x12.50R20LT
     
  2. Jul 6, 2015 at 3:20 PM
    #2
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    ProComp stage 1 7in lift, xtreme mt2 35x12.5r20,
    found this in the glove box, says 30 front and 33 rear? does this seem right?

    20150706_171453.jpg
     
  3. Jul 6, 2015 at 3:36 PM
    #3
    matluth

    matluth Fish On!

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    The glove box info is for the stock tires. The MT2 should have max load/psi info on the tire itself. A lot depends on what load range the tire is rated at. The web site for the MT2 should have recommended psi for normal everyday conditions.
     
  4. Jul 6, 2015 at 4:05 PM
    #4
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    if you read the card its not for the stock tires. A search at the procomp website only states max psi set at 65
     
  5. Jul 6, 2015 at 4:10 PM
    #5
    Wynnded

    Wynnded Wait, what?

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    Try the pressures suggested on the card, see how you like the ride and adjust accordingly.
     
  6. Jul 6, 2015 at 4:49 PM
    #6
    matluth

    matluth Fish On!

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    My bag, It appears to be the updated card for your tires. Low 30's psi seems low for a LT tire like the MT2, but, like Wynned stated start with what's on the card and see how that works out for you.
     
  7. Jul 6, 2015 at 5:02 PM
    #7
    14burrito

    14burrito New Member

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    Your tires are rated 3200lbs at 65 psi.
    Truck weights about 6k.

    3200x4= 12800
    6000/12800=.47
    65x.47= 30psi
     
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  8. Jul 6, 2015 at 5:08 PM
    #8
    matluth

    matluth Fish On!

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    Can't argue with the math. Well done.
     
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  9. Jul 6, 2015 at 5:39 PM
    #9
    14burrito

    14burrito New Member

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    Also hard to argue since the math equals what the paperwork suggested lol
     
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  10. Jul 6, 2015 at 8:40 PM
    #10
    Wynnded

    Wynnded Wait, what?

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    This looked so awesome that I ran outside in the dark and got the info from my tires, but there seems to be some limitations...

    Tires rated for 2833 lbs. @ 50 psi.
    My truck is RCSB. GVWR 6800 lbs minus rated payload (cargo plus passengers) of 1520 lbs. Truck weighs 5280 lbs.

    2833 * 4 = 11332
    5280 / 11332 = .47
    50 * .47 = 23.5

    That just doesn't seem where I'd be comfortable running my tires, the information on my door jamb does say 30 psi front, 33 psi rear for the standard 18 inch wheel setup. I have factory 20 inch wheels from a Limited though, maybe that's where things go awry. Still, I don't know. What are your guys thoughts?
     
  11. Jul 6, 2015 at 9:12 PM
    #11
    csuviper

    csuviper Moderator Staff Member

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    I run my 315/70R17 Duratracs at 40-45psi. Even wear thus far.
     
  12. Jul 7, 2015 at 4:36 AM
    #12
    chphilo

    chphilo New Member

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    Most e-rated tires have max psi of 80. Some wide tires (like yours) max out at 65. Among those with max psi of 80, the most common psi that people run at seems to be 45 (I ran mine at 65 for a while, then 50. Now I am at 45). I would probably run around 35 on your tires. By the way, have you done the chalk test?
     
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  13. Jul 7, 2015 at 5:41 AM
    #13
    14burrito

    14burrito New Member

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    I started my range D Yokohama ATs (3200lbs at 65 psi) at 45 per the Toyota update sent out for the Rock Warrior 17s and BFG AT....tires were wearing like absolute garbage. Down in the 30-33 range and you can tell a difference in the wear, much better now.
     
  14. Jul 7, 2015 at 6:26 AM
    #14
    matluth

    matluth Fish On!

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    I' m running at 45 psi with even wear. (Load range E, 10 ply). Chalk/imprint test can indicate over/under inflation. If I'm hauling heavy, I'll bump up accordingly. One thing to note is that factory recommendation (suggestion) is exactly that "recommendation". I agree that 35 would be a good starting point and follow up with chalk/imprint test. A lot depends on how good the tires' rubber/synthetic compound is when it comes to wear and tear too.
     
  15. Jul 7, 2015 at 8:18 AM
    #15
    csuviper

    csuviper Moderator Staff Member

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  16. Jul 7, 2015 at 8:47 AM
    #16
    bobeast

    bobeast really old member

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    Generally speaking, you should go by the sticker affixed to the truck unless there is a "recommended" pressure indicated on the tire. What you should NOT do is to run at MAX pressure as specified on the tire, unless you are running near max tire load, in which case you are probably overloading your truck..

    So, in order of preference;
    1) recommended pressure as stamped on tire
    2) recommended pressure as specified on vehicle sticker.
    3) max pressure as specified on tire.

    This is just a rule of thumb in the absence of a chalk test as mentioned by csuviper.
     
    Last edited: Jul 7, 2015
  17. Jul 7, 2015 at 1:09 PM
    #17
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    well geez, thanks for that info, ill go deflate them sunavabeeches in a bit. idk how or when the tires hit 40 front and 50 back but that TPSM is driving me nuts.
     
  18. Jul 7, 2015 at 4:17 PM
    #18
    Rkcruza

    Rkcruza New Member

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    I ran into this issue with my Taco Pro as it came with 8 Ply tires and the door sticker called for 46psi from Toyota....rode like a brick! Searched for tables showing load ratings at various psi and found this one from Toyo Tires. Only goes down to 35psi which may be due to heat issues with the LT tires at low psi. Find your size and check to see what weight they will carry at what psi and then set at then lowest pressure you can. Do the chalk test and see if all is good and adjust up or down to make the contact patch correct. Many mfgs. run way high pressures now to try to up the mpg. My 02 Tundra shows a lower psi for the P265/70/16 stock tires than is shown for the current gen Tacos and the Tundra weighs / carries more. They used to go way low on psi for ride, now go way high for mpg. Here is the chart.
     

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    Last edited: Jul 10, 2015
  19. Jul 8, 2015 at 4:43 PM
    #19
    Sweet_nasty87

    Sweet_nasty87 [OP] New Member

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    well i eneded up going to the dealership because the light was driving me nuts and turns out there is no sensors in the tires....WHAT!?! "yea your tires dont have sensors but you can buy them here with us at $190xtire" umm i bought the damn truck here. I just got it and you are telling me yall half assed the install?
    "sir, it is very unlikely that the company we use to install our lifts and tires would send us a setup like this" WHERE IS YOUR MANAGER BECAUSE NOW YOU ARE CALLING ME A LAIR!!! Long story short im getting them installed tomorrow morning for free
     
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  20. Jul 8, 2015 at 9:48 PM
    #20
    tat2ude39

    tat2ude39 MYota

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    I'm running my aftermarket tires at 40psi, and no problems. Handling and sound just like the stock tires.
     
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