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10 PLY tire recommended PSI

Discussion in 'Wheels & Tires' started by matambo, Dec 10, 2017.

  1. Dec 10, 2017 at 4:54 PM
    #1
    matambo

    matambo [OP] New Member

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    So i changed my 2017 tundra wheel and tires from 275/65/R18 to a 10Ply 285/55/R20. I had the local Tire Discount install it and they had the tires inflated to 38 as per what they usually do - im assuming. This is my first truck coming from 3 mustangs. 2011GT, 2014GT and a 2016GT which i upgraded all wheels and added nitrogen (Nitrogen assures more consistent pressure compared to air specially at high speeds/temperature) and this is my personal preference. So as i was at the local Costco to have the nitrogen on the tires, to my surprise they had the tire PSi at 48 being the recommended tire pressure for a 10Ply on a 20" rim is supposedly ranging from 48-55. Im confused..... all you guys having the 20" with a 10Ply tires, what are the tire pressures you are running? Thanks in advance and here is my truck with the 10Ply tire on 20: wheels.IMG_4628.jpg
     
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  2. Dec 10, 2017 at 5:22 PM
    #2
    14burrito

    14burrito New Member

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    I'm 33/35 front and 30 rear for daily driving. Bump up as necessary for towing. Tires wearing just dandy.
     
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  3. Dec 10, 2017 at 5:31 PM
    #3
    TheBeast

    TheBeast El CreepO

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    40 psi on toyo RT
     
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  4. Dec 10, 2017 at 5:33 PM
    #4
    Coolhardy

    Coolhardy New Member

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    Too many to list
    40 on all 4
     
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  5. Dec 10, 2017 at 5:50 PM
    #5
    matambo

    matambo [OP] New Member

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    ok. isn't that too low? how is the treadwear on the tires? i also have an AT tire. would the low pressure effect the grip on the freeway. i don't do off road. thanks
     
  6. Dec 10, 2017 at 6:06 PM
    #6
    14burrito

    14burrito New Member

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    I'd have to check, I want to say I'm close to 20k miles and I'm like 80% tread still just eye balling it. I can take a measurement tomorrow.

    Ride quality and wear is why I chose what I did. Started at 45psi and the I felt it was WAY too stiff for me.

    Lower pressure will provide better highway grip, too much pressure your contact patch lessens because your riding on only the inside tread instead of the full tire width.

    Off-road I drop down to 15/20 depending on terrain.
     
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  7. Dec 10, 2017 at 8:44 PM
    #7
    jeremyd

    jeremyd 2014 Crewmax SR5

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    ProComp 6" 35/12.50/18
    30/33 on my 10 ply AT's, KO2's, 35/12.50/18
     
    Last edited: Jan 1, 2018
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  8. Dec 10, 2017 at 9:07 PM
    #8
    the_midwesterner

    the_midwesterner New Member

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    None, yet....
    None of the: "X specific pressure because my truck runs perfect" is valid. If anything, it's pretty junk unless you have the stock tires, but the truck was designed to run on those specific tires, at that specific pressure.

    Since you have changed tires, do the chalk test. The variability of what people carry in their truck, the weight, suspension, etc. etc. all affect this. It's best just to do it with a tried and true process.

    Chalk test: https://m.youtube.com/watch?v=MIvbFgrH0IQ
     
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  9. Dec 11, 2017 at 4:18 AM
    #9
    Netmonkey

    Netmonkey Don't be a Dumbass

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    I started at 40psi on mine and found it way too bumpy and jittery. so I backed it off to about 35psi and it feels much better.
     
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  10. Dec 11, 2017 at 4:35 AM
    #10
    Tundraplatinum

    Tundraplatinum New Member

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    pressure on side of tire is the maximum psi. tire manufacturer should have a chart for correct pressure for amount of load. also don't waste your money on nitrogen air is like 78% nitrogen anyways and it really does nothing for you. most shops that jumped on the nitrogen bandwagon jumped off years ago
     
  11. Dec 11, 2017 at 5:20 AM
    #11
    matambo

    matambo [OP] New Member

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    might take this route also. thanks
     
  12. Dec 11, 2017 at 5:24 AM
    #12
    matambo

    matambo [OP] New Member

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    thank you for the tip. will do the chalk test also
     
  13. Dec 11, 2017 at 6:07 AM
    #13
    chphilo

    chphilo Tundra addict

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    Is the maximum psi for your tires 65 or 80?
     
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  14. Dec 11, 2017 at 6:55 AM
    #14
    matambo

    matambo [OP] New Member

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    Its 65psi
     
  15. Dec 11, 2017 at 10:27 AM
    #15
    RussellVaughan

    RussellVaughan New Member

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    i'm assuming your 10 plys are LT's? If so, they should be at least 45 psi. My stock LT285s have recommended 49 psi according to inside door panel. My tire pressure light comes on at 40 psi. Had a nail removed at discount tire and they filled up to 35 psi, assumed they were passenger tires. i got in my truck and my check tire pressure light came on.
     
  16. Dec 11, 2017 at 10:28 AM
    #16
    csuviper

    csuviper Moderator Staff Member

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  17. Dec 11, 2017 at 10:33 AM
    #17
    NewImprovedRon

    NewImprovedRon SouthBoundSteve Fan Club President

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    285/55/R20's here (BFG KO's) at 49lbs across the board.
     
  18. Dec 11, 2017 at 12:48 PM
    #18
    matambo

    matambo [OP] New Member

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    yup they are LT285/55/20 and max psi is 55.
     
  19. Dec 15, 2017 at 5:32 PM
    #19
    Tony v

    Tony v New Member

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    Looks nice
     
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  20. Dec 15, 2017 at 9:16 PM
    #20
    MonzTris

    MonzTris Tundra down under

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    I've always found the 4psi test to work well for heavy vehicles - what most guys in Australia use with their landcruisers/patrols etc.
     
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  21. Dec 16, 2017 at 6:58 AM
    #21
    matambo

    matambo [OP] New Member

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    4Psi test? hmmmm how does that work?
     
  22. Dec 16, 2017 at 7:05 AM
    #22
    MonzTris

    MonzTris Tundra down under

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    Set your cold tyre pressure, then check it again after about 30-60 minutes of driving. If it's more than 4psi higher than the original pressure, you need to raise your cold tyre pressure. If it is less than 4psi more, then you need to lower your cold tyre pressure.
     
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  23. Dec 16, 2017 at 6:38 PM
    #23
    MarkM0369

    MarkM0369 New Member

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    275/70 KO2, Pro Hood Bulge and grille, OEM fender flares, Fox rear shocks
    The deal on tire pressures is you have on the stickers inside of the drivers door, the vehicle GAWR, or gross axle weight rating, so for my truck, (a 2017 DC 4x4) its 4000 lbs on the front 4150 for the rear axle on 255-70-R18 tires. Manufacture recommended PSI is 30 front 33 rear. So these #s Weight Ratings)are the most that Toyota recommends to be placed on each axle, not the total vehicle, which is the lower #, the GVWR, which in my case is 7100 lbs. (The most the vehicle should weigh loaded up)
    So using Toyota's #s and recommendations, you can google up a chart on tire pressures and load ranges. I use one from Toyo, (don't have the link as i just put it on my phone as a PDF),but any one is fine, all tires must conform to these specs regardless of manufacture. Also understand that P series tires load capacity must be De-Rated by 10% if installed on a light truck (or suv or mini van) this is mandated by the Feds, so going off the chart for P 255-70-R18 tires a cold PSI of 29 lbs will give me 2249 lbs of capacity for each tire, 32 psi will give me 2359, and 35 will give me 2469 lbs respectively, so deduct your P series 10% and we are good to meet MFG Specifications for load capacity of the tires and the max axle capacity at the pressures Toyota recommends.
    When I switched tires to BFG KO2s 275/70-18 LT tires, on a single tire per side (as opposed to dual-lies), I need 35 PSI to hit 2070 LBS per tire, 40 will give me 2270, 45 will give me 2470, for a load range E tire OR 2680 for a max capacity of a load range C tire, Load range E tires keep right on climbing to 3640 per tire at max PSI of 80 Lbs
    So at a minimum, for the KO-2s I need 35 lbs each to meet the weight capacity limits on each tire, and the axle. I tend to run around 45 as the KO-2s tend to kill the mileage a bit, and lower them down as needed in the dirt. Also, since they are 10 ply tires they have a stiffer, thicker side wall, so they do ride a bit "stiffer" as well. In the OPs case going from 18s P tires to 20 LT and the lower profile 55 tires, the side wall on those will be like a rock so probably pretty noticeable ride difference. not much side wall to flex. Personally I like the stiffer LT tires as it makes the handling a bit less mushy.
    For the OP, the chart says to run 40 PSI to at least meet MFG load recommendations on that tire size, if you want a softer ride and are not too loaded, you could get away with a bit less, 50 PSI will give you 2400 Lbs of load capacity per tire but that doesn't mean the rest of the parts can handle it, and they may wear unevenly as well, hence the "chalk test". Also lower pressures off road let the tires flex or wrap around rocks or what ever, and can save a tire from puncture, as well as grip better, but will flex too much riding down the Highway and you risk a blow out if too far below the recommended PSI for that tire size.
    If you want more specs the TOYO guide goes much more in depth, but there is some method to the madness
    Hope this helps
     
  24. Dec 17, 2017 at 4:41 AM
    #24
    Patriot

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    40# on my 285/60/20 -10 plys.
     
    Last edited: Jan 1, 2018
  25. Dec 17, 2017 at 7:47 AM
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    matambo

    matambo [OP] New Member

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    man that was helpful. thank you.
     
  26. Dec 17, 2017 at 8:03 AM
    #26
    MotoTundra

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    Good info!
     
  27. Dec 31, 2017 at 7:34 PM
    #27
    netranger6

    netranger6 New Member

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    None. Keeping this one stock.
    48 here.
     
  28. Dec 31, 2017 at 7:43 PM
    #28
    netranger6

    netranger6 New Member

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    None. Keeping this one stock.
    BFG KO2 AT, 285/55 R20, LT, all at 48. Been running this for years and seems good to go.
     
  29. Dec 31, 2017 at 7:47 PM
    #29
    Stumpjumper

    Stumpjumper New Member

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    +1, had them rotated at dealer and they filled to 40. First cold morning the light came on. Door sticker for mine is 46. I think they are D rated. 285/55/20 KO2s
     
  30. Jan 1, 2018 at 4:52 AM
    #30
    MotoTundra

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    275/65/18 KO2's here, I called BFGoodrich and they recommend 55 psi for that size tire under normal circumstances.

    Tire shop recommended 40-45.

    I think I'm going to start with 50.
     

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