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Cooper ST MAXX thread

Discussion in '3rd Gen. Tacomas (2016+)' started by Z50king, Jul 31, 2017.

  1. Jan 13, 2018 at 11:40 AM
    #61
    jeffreywanderson9

    jeffreywanderson9 Well-Known Member

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    OME w/ dakars, Method NV 17", 275/70/17 Cooper AT3
    Hey guys, so I got the maxx's E load 255/80/17 and was wondering what I should have the PSI set at. I have a four wheel camper on the back right now weighing in at around 1300 lbs. Thanks!
     
  2. Jan 13, 2018 at 12:42 PM
    #62
    St.Germain

    St.Germain Sport truck!

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    chalk test recommended! different pressures for different loads. chalk tells the truth of how your tires distribute the weight, no substitute and takes 10 minutes.

    I'm unloaded, no extra weight, and run 30psi F/27psi R warm. but I'm also on 265/65-17's (st maxx E's) so i can get away with super low pressures.
     
  3. Jan 13, 2018 at 12:59 PM
    #63
    splitbolt

    splitbolt Well-Known Member

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    36 psi will get you back to load carrying capacity or GVWR.

    Since your'e over GVWR by at least 150lb...
    For your size and load rating, 1 PSI=38 lbs load capacity at each tire.
    1 PSI @ 38 lbs load capacity x 4 wheels = 152 lbs additional load capacity.
    So at least 37 PSI.

    I'd go weigh it as you intend to have it fully loaded, and add 1 PSI(to 36 PSI) at each tire for every 150 lbs above GVWR.
     
    Traegermaster likes this.
  4. Jan 13, 2018 at 6:46 PM
    #64
    swissrallyman

    swissrallyman Well-Known Member

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    I run 32 psi front and 30 psi rear on the road empty. Air down to 22/20 in the dirt.
     
  5. Jan 13, 2018 at 7:21 PM
    #65
    Mike G

    Mike G Well-Known Member

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    Same here, it works.
     
  6. Jan 13, 2018 at 8:06 PM
    #66
    splitbolt

    splitbolt Well-Known Member

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    Means nothing for comparison without knowing weight and tire size.
     
  7. Jan 28, 2018 at 6:18 AM
    #67
    atxboug

    atxboug Well-Known Member

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    OME Nitrochargers/HD Dakars/Cooper ST Maxx/Alu-Cab Canopy/James Baroud RTT
    I ran the chalk test (using a sharpie was easier) with the following load in my 3rd Gen DCSB:

    Alu-Cab Canopy: 140lbs
    James Baroud RTT with Sleeping Gear: 170lbs
    Other gear in bed: 200lbs
    Rock sliders 100lbs
    OME Shocks and HD Dakars
    ST MAXX 255/85/16s on OEM TRD OR 16x7.5 wheels

    28 fronts; 30 rears for even wear

    Also called Cooper customer service directly; their recommended PSI was 30 and he acknowledged that the 255/85/16s will ride on the centers if inflated to 30+ PSI, but will even out after that. With the E-rated sidewalls it seems these tires are completely fine in the 20s if thats what it takes with a particular (light) load for even wear.
     
    St.Germain likes this.
  8. Jan 28, 2018 at 7:31 AM
    #68
    DMT187

    DMT187 Well-Known Member

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    Here's a pic of mine. 255 80 r17.20180127_134523.jpg
     
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  9. Jan 28, 2018 at 7:57 AM
    #69
    St.Germain

    St.Germain Sport truck!

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    about the same here. :thumbsup:
     
  10. Apr 3, 2018 at 5:55 PM
    #70
    RKMC Maverick

    RKMC Maverick Member

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    What rims, lift? Any rubbing?
     
  11. Dec 8, 2018 at 9:13 PM
    #71
    desertbound1024

    desertbound1024 Active Member

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    Got mine on today 255/85r16

    08137C7B-B6EE-4D46-8A93-5EB038217270.jpg
     
    trackdaybro likes this.
  12. Dec 8, 2018 at 9:16 PM
    #72
    the.sight.picture

    the.sight.picture Well-Known Member

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    Check the build thread in SIG
    Ive had my tires on stock offroad wheels down to 8 psi when off roading. I keep my tires are 36-38 in the summer, 32-35 in the winter
     
  13. Dec 29, 2018 at 4:36 PM
    #73
    jrain904

    jrain904 Well-Known Member

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    Anyone have 265/70R16 stmaxx on a stock trd offroad? If so what's your mpg? Thanks!
     
  14. Dec 29, 2018 at 4:47 PM
    #74
    Skymaster

    Skymaster Well-Known Member

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    If you want a good off road tire, pull the trigger. If you want MPG info, go to Costco and get the lightest tire you can get

    I have 265/75/16 StMaxx and love them. Have pinched, pulled, stretched them over High SierrA granit, death valley tire shredding rocks, snow and sand with 0 issues
     
  15. Dec 29, 2018 at 7:01 PM
    #75
    jrain904

    jrain904 Well-Known Member

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    Are these good in mud and clay? Trying to decide between these and falken at3w.

    With my topper I am already averaging 18.7 combined. I really dont want to be below 17 mpg combined
     
  16. Dec 29, 2018 at 7:04 PM
    #76
    the.sight.picture

    the.sight.picture Well-Known Member

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    Check the build thread in SIG
    Although my tires are a different size then you are asking about, I ve found that the St maxx have excelled at everything ive thrown at them. I off road in clay, water and rock. (and some mud)
     
  17. Dec 29, 2018 at 7:06 PM
    #77
    redbull9944

    redbull9944 Well-Known Member

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    Prinsu Rack, 275/70R17 Cooper ST MAXXs, TRD PRO 4Runner Wheels, 5100s
    I think the most you'll lose is 1 mpg. For reference, I just put on the ST MAXXs in 275/70r17 which are close to a 33 inch tire and I'm getting about 16.5-17 in the mountains in PA.

    I just got done with a 900 mile trip hauling a 1700 pound trailer and averaged almost 15mpg. So lift, bigger tires, roof rack, and trailer and still wasn't too bad all things considered
     
    jrain904 and the.sight.picture like this.
  18. Jan 7, 2019 at 7:05 AM
    #78
    bigonenine

    bigonenine Member

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    Looks great! Do you have any pics of the truck in action with these new tires?
     
  19. Jan 11, 2019 at 3:25 PM
    #79
    oldbarn70

    oldbarn70 Member

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    I know this is a year old thread, but what do you think of these tires after a year and a half? Do they seem as stiff as some people say? How is your MPG and what do keep for PSI? Any info would be great. I am not sure whether or not to get C load tires like the Grabber X3 or Toyo AT2 to keep the ride a little less stiff. Thanks for any info!
     
  20. Jan 11, 2019 at 4:08 PM
    #80
    aleriance

    aleriance Lurking...

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    That sounds fantastic. I'm between 13.5-15 average with 275/70R17. Missing the good old stock tire days... but then you hit the dirt and...
     

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