Dumb question about wheelbase

Discussion in 'Trucks [ Eighteen Wheelers ]' started by No names left, Jan 11, 2016.

  1. No names left

    No names left Light Load Member

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    I am new to all of this so this may seem like a really dumb question, but I’ve looked and can’t find an answer or figure it out.

    I’m just looking at some of the different trucks, models, options, etc., and noticed something but don’t understand why the manufacturers do this. I see a model of truck, same year, same cab, same sleeper, same axle rating, same everything really ………… except the wheelbase varies by as much as 12” to 14”. It seems to me it would cost the manufacturers a lot of money to have so many different wheelbase setups, but I’m sure there has to be a reason behind it and I’m hoping someone could explain it to me. I’d guess that in addition to the wheelbase, the frame would have to vary as well.
     
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  3. Ozdriver

    Ozdriver Heavy Load Member

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    All trucks to a certain extent are custom built, especially KW and Pete, they aren't like cars on a mass production line.
    Short wheelbase for around town work, log trucks, etc where you need manoeuvrability.
    Long wheelbase for OTR where you want big sleeper and more fuel.
     
  4. No names left

    No names left Light Load Member

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    I didn't think to look at tank size, but I know I saw some KW's with the same size sleeper and a 14" wheelbase difference. I know with car manufacturers, they will do something to save a half-cent per unit so I am surprised to see this much of a difference. I can see where a short wheelbase would help in city driving and tight drop yards.
     
  5. Ozdriver

    Ozdriver Heavy Load Member

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    Also the longer the wheelbase the better the ride
     
  6. strollinruss

    strollinruss Road Train Member

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    A lot of the time the salesman, or whomever makes the listings doesn't know how to measure wheelbase. It happens all the time. So, it could be they just measuring it different even though there is only one way to do it right.
     
  7. jammer910Z

    jammer910Z Road Train Member

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    There are no dumb questions if you do not know the answer. We are here to help. Only the jerks will give you a smart reply.

    Don't be ashamed to ask.
     
  8. Starboyjim

    Starboyjim Road Train Member

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    Shorter wheelbase provides a tighter turning radius so you can crunch your cab extenders proficiently.
     
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  9. Pedigreed Bulldog

    Pedigreed Bulldog Road Train Member

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    Pulling a van, the trailer is typically tucked up close to the back of the cab for aerodynamics.

    The same make/model/sleeper truck if spec'd for flatbed work will be a little longer, so that a headache rack can be mounted and longer pieces can overhang on the front of the trailer without getting into the cab.

    Wheel base might also be stretched in order to carry more weight legally under the federal bridge formula...greater distance between the axles, the heavier load that group of axles can carry.

    Spec'ing a truck is not a "one size fits all" sort of thing. The specs you need depend entirely upon what you need the truck to do for you.
     
  10. fortycalglock

    fortycalglock Road Train Member

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    Trucks aren't built like cars. There is no standard model. The person orders and specs pretty much every component from the seats, axles, wheelbase, suspension, engine, transmission, even the hubs and bearings. Even the thickness of the frame can be different depending on what you want the truck to do.
     
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  11. dirthaller

    dirthaller Road Train Member

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    And don't forget.......wheelbase is measured from the CENTER of the tandems to the center of the front axle.
    Some folks think it's measured from the center of the front axle to the center of the rear axle.
     
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