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Thread: STT Pro 37s Load Range D or E

  1. #1
    Hooked JoeB-JKURX's Avatar
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    STT Pro 37s Load Range D or E

    I'm moving from my 35" KM2s to 37" STT Pros. I'm inclined to go to the 13.50x17 because it is Load Range E (likely a stronger sidewall) but am concerned that the ride will be too stiff for my 2014 Rubicon X that has (probably) 800# of added weight through various mods and adds. The 12.5x17 is offered in Load Range D which is what I run on the KM2s and the ride is OK. Any opinions on the various trade-offs would be appreciated. Thx

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    Administrator wayoflife's Avatar
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    The 13.50's is what I run and mainly because of the range E rating. I just run them at a lower psi like 28 or so.

  3. #3
    Nothing but a Thing jdofmemi's Avatar
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    I was wondering the same thing, as that will likely be my next set of tires.

    Glad to hear it.

  4. #4
    Hooked JoeB-JKURX's Avatar
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    Quote Originally Posted by wayoflife View Post
    The 13.50's is what I run and mainly because of the range E rating. I just run them at a lower psi like 28 or so.
    Sounds like a plan. Thx

  5. #5
    Nothing but a Thing Red Knight15's Avatar
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    STT Pro 37s Load Range D or E

    I have the 37x13.50s Load range E. Iím running 28psi on highway and 12 off road. They ride fine.


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  6. #6
    Nothing but a Thing RESURECTIONJK's Avatar
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    I will echo what everyone is saying as well. I run the STT pro in a 37x13.50 load range E on my 4dr and Iím probably close to 700 lbs heavier than stock. But thatís just s guess. I run 28-30 psi and itís fine on the roads here in salt lake. Trail pressure is 8-12 depending where Iím at.

  7. #7
    Nothing but a Thing desertrunner's Avatar
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    Quote Originally Posted by Red Knight15 View Post
    I have the 37x13.50s Load range E. Iím running 28psi on highway and 12 off road. They ride fine.


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    Exact same for me as well

    Sent from my SM-G950U using WAYALIFE mobile app
    12' 2dr Gecko Sport 6 speed
    PR44, ARBs, 4.88s, 35 spline rear, Adams 1350 Front & Rear, Rubi T-case, Rubi sway bar + Evo no limits, Evo armor & skids, 37/13.50" Cooper STT Pro, Evo 2" plush / OME med duty springs

    ***SOLD*** 08' JKU Rubicon 6-speed Stone White, 3.5" RK lift, 37" KM2s and lots more.
    ***CURRENT DD*** 16' F150

  8. #8
    Addict Ddays's Avatar
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    I'm running the 37x13.50's Coops too. My CAT scale weight fully loaded is just under 6000#. I run 26# highway, but our roads in PA suck donkey dick, so there's that. Best starting point to figure psi is to do the chalk test. You can fine tune from there if you want
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  9. #9
    Been Around the Block SLO's Avatar
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    Thatís the only thing I donít love about jumping to 40ís. The STTís (as well as Nitto) go to a C rating. Does stiffer sidewall necessarily mean stronger, though? Ply is still the same right?


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  10. #10
    Addict wjtstudios's Avatar
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    I was wondering the same thing. The BFG 39-13.5s go to a load range c as well. Are the plys thicker on the larger tires? Is that why they donít use as many as the Ds and Es?


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