Oregon Bridge / Brick & Stick axle weights

Discussion in 'Flatbed Trucking Forum' started by glitterglue, Dec 8, 2015.

  1. glitterglue

    glitterglue Light Load Member

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    Jan 22, 2011
    Adair Village, OR
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    First off, 80k is easy. Been there, done that, never an issue.

    I'm specing out a new truck with a lift axle and a quad axle trailer for 105,500 gross. Since you guys always have an opinion and a good knowledge base, I'd like another set of eyes on my math and axle spacing.

    I'm based in Oregon and their bridge weights are the lowest in the Pacific NW but I also am wanting to keep my off track to 5.5 (for Idaho blue routes). I've not driven a tractor with more than a 244" wb - and yes, I do fully understand the effect the extra tractor length has on ones turning radius.

    So far, this is what I've got:

    Tractor: 268" / Trailer: 53', 18" kp, 16' 6" spread

    1 ------ 2 -- 3 -- 4 ------------------- 5 -- 6 -- 7 ---- 8
    (8 Axles - Length: 69.83 ft.)

    1 - 2: 13' 10"
    2 - 3: 4' 3"
    3 - 4: 4' 3"
    4 - 5: 30' 9"
    5 - 6: 5' 1"
    6 - 7: 5' 1"
    7 - 8: 6' 4"

    From the Oregon tables (and online calculator), I get the following max weight distributions:

    Axle / Wheelbase / Table 1 / Table 2
    1 - 4 / 22' 04" / 56,500 / 56,500
    1 - 8 / 69' 07" / 80,000 / 105,500
    2 - 4 / 8' 06" / 42,500 / 42,500
    2 - 8 / 55' 09" / 80,000 / 90,000
    5 - 8 / 16' 06" / 53,500 / 53,500

    This gives me at 15,500 on my steers while still having ~66k on the deck (by my calculations). Is this "normal" or should I be looking at a lower steer weight and stretching out another 24 - 36" (putting the tractor at 282 - 296" - which will kill the Idaho off track).

    I know I can snug up the trailer in ID by adjusting the 5th wheel, but not enough, by my measuring, to keep the 5.5 off track and not take out the landing gear on the first good turn.

    What am I missing or what can I change up to better distribute the weight - if at all - while maintaining my 5.5 Idaho off track?

    Thanks!
    Michael
    --------------
    This isn't a term paper, but for quick access:

    References:
    https://www.oregontruckingonline.com/cf/MCAD/pubMetaEntry/ODPermits/weightAnalysis/

    Weight Table 1 (up to 80k):
    http://www.odot.state.or.us/forms/motcarr/od/8110.pdf

    Weight Table 2 (over 80k):
    http://www.odot.state.or.us/forms/motcarr/od/8111.pdf

    Idaho off-track Calculator:
    http://itd.idaho.gov/dmv/poe/offtrack.html
     
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  3. mountaingote

    mountaingote Road Train Member

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    Your lift axle will take weight off the steer. The rest of that nonsense is foreign to me
     
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  4. RGN

    RGN Road Train Member

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    I think you will still need to permit for overlength on blue with over 48' trailer.
    My truck is factory NW spec- 13,200/13,200/40,000 @ 12-9/5-4/4-4(244"wb).
     
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  5. Long FLD

    Long FLD Road Train Member

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    Mar 4, 2015
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    image.jpg

    Here's a truck I drove from 05 to 08, then moved into a similarly spec'd 09. 244" wb with an "Idaho" spec trailer. It's maxed out at 5.5 off track the way it sits. I could bridge 104,500 everywhere but OR and that was pushing 13kon the steer axle with the lift down. OR had us cut back to 102000.

    Where is most of your freight? Seems like you can be 5.5 but get hurt in OR, or stretch out for OR and hurt your offtrack.

    There was a guy from Missoula that used to run a 300" wb Pete and his quad had 2 steerable lifts for the back 2 axles.

    Another option is to stretch the truck out, get your 11ft spread on the lift, and pull a 48ft tri-axle. If you can do that and get your tare down around 30-31k you could still load 65k or so and not have to worry about ID offtrack.
     
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  6. Oscar the KW

    Oscar the KW Going Tarpless

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    May 19, 2011
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    What is this ID 5.5 off track?
     
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  7. Long FLD

    Long FLD Road Train Member

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    If your trailer is over 48ft and you want to run non-national network highways you have to buy an offtrack permit. If you click on the Idaho link in the first post and zoom in you can see where they measure. Basically it amounts to if you can go around corners on the skinny roads and stay in your lane.
     
  8. snowwy

    snowwy Road Train Member

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    I couldn't meet 5.5 with a standard wb KW. And CLOSED axles on a 53 step. I needed to move my 5th up to shorten the bridge between drives and tandems but it was bolted in place.

    You also can't weight more then 12,300 on the steers i think it was said by the scale house. ( although, i've rolled in at 12,700 on just fueled tanks from ontario ). And Oregon Bridge weight is 2,500 pounds less then federal bridge weight.

    Also, if you run a lift, be careful on your steer weight that it's not too light. Oregon won't stop you but they WILL call the cops for unsafe steer axle weight. ( I think 9500 lbs is what i was told )

    I paid Oregon $300 for that information because i was legal for federal but not for oregon.

    I would call idaho and see if they can give you bridge length for the 7 axles to meet that 5.5. And then call oregon to see what oregon bridge weight would be with that idaho bridge length.
     
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  9. Long FLD

    Long FLD Road Train Member

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    Whatever your tires are rated for is what you can go on the steer. We would be 12900 to 13100 with our lift down. Our 7 axle bridge was short for offtrack and we'd max it out so we had to pack the weight up front to go 104500.
     
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  10. Long FLD

    Long FLD Road Train Member

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    @glitterglue If you're still in the process of specing everything out you should get ahold of Western. They used to give you a print out of all your measurements based on how you want your truck and trailer set up. You'd know your offtrack and OR bridge before you buy the equipment.
     
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  11. Dominick253

    Dominick253 Heavy Load Member

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    I tried explaining this to my coworkers. They say I'm stupid for sliding my tandems on a 53' van. I think they're stupid for not knowing the law. Had one tandem that wouldn't slide so I told my dispatcher that I'd be violating the bridge law. So he asked if I'm going over any bridges!!! I haven't laughed so hard in a long time.
     
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  12. Long FLD

    Long FLD Road Train Member

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    I've never pulled a van in ID but I think they let you go 38000 on your trailer tandems to comply with the offtrack rule.
     
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