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True height of BFG MT

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Cavalry, Aug 26, 2001.

  1. Cavalry

    Cavalry 1/2 ton status

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    What is the actual height of a 33x12.5 and 35x12.5 BFG MT at nominal pressure?

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My old 33" BFG MT's were a shade over 31" true hieght at street pressure, mounted on 15x10.s. They had about 60% left on them when i measured. When new they might approach 32" true height...[​IMG]

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    BF Goodrich says their 35x12.50s are 34.7" tall and that their 33x12.50s are 33.9" tall.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. DesertDueler

    DesertDueler 1/2 ton status

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    It really depends on the wieght of the vehicle and the rim you use. The lighter the vehicle the taller. The wider the wheel the shorter.

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  5. ftn96

    ftn96 1/2 ton status

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    My 33 12.50 on 15x10 wheels at 35 psi are measuring at 32" inches!!!

    What is and what should never be....
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well Tim...how about relaying some personal experience instead of spouting what "So and So said" or did. BFG is lying by publishing those numbers...I measured my 60 % left BFG off of the truck and got 31 1/4" on the recomended rim at the recomended pressure.

    Interco is prolly the most accurate as far as published tire sizes versus reality...My almost bald 36" TSL's are still 35 1/4" tall. add the amount of tread worn off and 36.3" new is pretty damn close!

    What would you expect BF goodrich to say? They will never admit how far off the true diameters really are.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  7. Cavalry

    Cavalry 1/2 ton status

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    OK kids now everyone play nice now
    I already had already checked out the BFG site and realized they were fibbing a bit. So we will say 33's are really about 32...anyone have more info on 35x12.5's?

    "There is a fine line between hobby and mental illness"
    Luke
    84 K5
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Rene,

    No problem. I'll measure mine as soon as I can. I went looking for my tape measure just for you but I couldn't find it.

    My fronts are on 15x8s, rears on 15x10s, and they're 35x12.50s. I have to convert my front back to 8 lug. I didn't have any good 8 lug rotors so I left it 6 lug for a little while.

    <a target="_blank" href=http://mavericktim.freeyellow.com/wholetruck1.jpg>And here's all the personal experience I need right here.
    </a>

    Works now!!!!

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    All yer personal experience says that the page is unavailable...kinda ironic actually[​IMG]

    I do enjoy bugging you a bit Tim...I hope you realize its all in fun.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  10. Butch

    Butch 1/2 ton status

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    My 35's are 34 3/8 at 32psi on 10" wheels

    I thought I was wrong once,
    but I was mistaken
     
  11. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    When they were new my BFGs measured just under 34 3/4". 35x12.50-R15 on a 15x8 @ 35 psi. BTW if you mount them on a 15x10, which is what BFG recomends they will be a lot shorter. My #2 spare (on a 15x10) is is visible shorter than the other 5 (on 15x8s)

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I think it just looks shorter. I'm pretty sure the actual heights are pretty close.

    I don't mind if you bug me. I don't like how you make me seem full of **** all the time though. I might be young but I have been there and done that at least a little with these trucks.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    So everyone here that is measuring tire diameter has taken two straightedges across the tread 180 degrees apart, with tire/wheel off vehicle, and measured that way? I'm not calling anyone a liar or dumb, but that is the only way you are going to get a semi acurate reading. Even then, wheel width is going to make a difference.

    Kind of like tread width as well, it typically seems MUCH less than what the manufacturer claims. Again wheel width will make a difference all else being equal

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Tim, I'm assuming this is in regards to my post.
    <blockquote><font class="small">In reply to:</font><hr>

    I don't like how you make me seem full of **** all the time though. I might be young but I have been there and done that at least a little with these trucks.

    <hr></blockquote>

    I don't physically put your foot in your mouth, but glaring contradictions and second hand info i don't have time for. I mean no ill will and its not something personal. We all just want acurate first hand info or experience. Occasionally there seems to be a little too much about what your friends truck did or didn't do. Nobody here including myself knows it all about everything...
    When I quote you I try not to take it out of context or twist it in any way.

    Did you measure your tires?

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    No, not yet, but as you can see in the picture, my truck wears a set of 35" BFGs. I just never bothered to measure them before.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  16. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Tire was on the truck, I layed a level across the top and measured from that to the ground. Tire was new, had about 20 mi on it (tire store to my house)

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  17. dyeager535

    dyeager535 1 ton status Premium Member

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    So thats like 1200 lbs (4800/4) on that tire. It is definitely going to compress some, in that case, I would measure the distance from rim to straightedge on TOP of the tire, then compare that with the rim to ground measurement. I'm betting 1200lbs is going to add at LEAST 1/4" of "squat" to the tire.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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