Bridge Formula Math Check

Discussion in 'Trucking Industry Regulations' started by iamrobg, Feb 18, 2012.

  1. iamrobg

    iamrobg Light Load Member

    52
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    Jan 15, 2012
    0
    So running through this bridge formula about 16 times i think i finally figured it out! :biggrin_2556:

    6 Axles, 61 Feet spacing between the front and rear axle.

    LN=366
    N-1=5
    Total 73.2

    12N=72+36=108=73.2=181.2.

    500x181.2=90,600LB.

    Does this make sense now or did i mess up? What would I be limited to, still 80,000lb? This is a lowboy and a heavy haul tri-axle truck. 20K fronts and 46K rears and the lowboy has 25K rating on 3 axles.

    Thanks for the help!
     
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  3. jorlee

    jorlee Light Load Member

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    Feb 17, 2007
    ND
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    You may just be on the right track, but:

    What state are you running in?

    Are you running interstate's or state roads?

    What size are your front tires?
     
  4. Prairie Boy

    Prairie Boy Road Train Member

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    You're looking at legal axle weights. Now, find out how much you can pack with an Overweight Permit.
     
  5. haulhand

    haulhand Road Train Member

    But you can only be overweight if your load is not reducible just one single piece. Usually you can pack 60k and 60k plus whatever you can get on your steers.


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  6. Prairie Boy

    Prairie Boy Road Train Member

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    Edmonton, AB
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    How's the rig moving in your part of the world?

    Though you might enjoy. Probaly pulling a couple hundred tons.


    [ame]http://www.youtube.com/watch?v=G75euJ-Vmxg&feature=related[/ame]
     
  7. haulhand

    haulhand Road Train Member

    Rig moving is really kicking. That video is cool I've seen it before though. Still busy in canuckland?


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  8. Prairie Boy

    Prairie Boy Road Train Member

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    Edmonton, AB
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    Slowed right down due to extremely warm weather. Road bans on in some area and the Golf Ciurse fown at taber has be open since late January. I'm 70 and have never experienced anything like this.
     
  9. iamrobg

    iamrobg Light Load Member

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    Jan 15, 2012
    0
    I have the big floater front tires i think 425 or 455x22.5 i dont remember off hand. I'm running interstate but based out of New York (long island) and mainly east coast out to illinois the farthest west. Oversized load wise i'm sure with that setup i could easily pull the 100K trailer limit.
     
  10. haulhand

    haulhand Road Train Member

    I don't think you'll ever get 100k on the deck just not enough axles. If you max right out you can get 140 gross but I've never seen a 4 axle long wheelbase truck get over 14 on the steer so that limits you to 134. Your lightweight is probaly between 42 and 48 so that gives you between 86 and 92 on the deck but it's hard to get proper placement to max axle weights so your probably safer with under 82 on the deck.
     
  11. haulhand

    haulhand Road Train Member

    I'd heard it was slow with the warm weather. We've got early bans on in ND too.
     
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