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Should I change my 80R24.5 tires to 80R22.5 for my 97' Freightliner Classic?

Discussion in 'Freightliner Forum' started by AllSeasons, May 8, 2013.

  1. May 8, 2013 #1
    AllSeasons

    AllSeasons Bobtail Member

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    May 8, 2013
    0
    First time posting here! We're a small trucking company with 5 trucks. My husband can't decide if he should switch the tires on a '97 Freightliner Classic that he just bought. We have 5 trucks altogether with this one. Our other trucks have 80R22.5 while this one is 80R24.5.

    I think it makes more sense for the same tire for all of the trucks but he likes the big tires. Any opinions? Is there a benefit for the different size tires? Better fuel (haha)? Will they last longer?

    Thanks!!
     
    AllSeasons, May 8, 2013
    AllSeasons, May 8, 2013
    #1
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  3. May 8, 2013 #2
    jbatmick

    jbatmick Road Train Member

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    hastings, Fl
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    More info would be needed to make a good judgement. Flat-land or mountains ? Transmission ratio ? Rear ratio ? Weight hauled ? Speed requirements ? Motor HP ? Trailer height requirement ? Most newer equipment use the 22.5 tires, and it makes sense to try to have all the trucks with the same size rubber.
     
    jbatmick, May 8, 2013
    jbatmick, May 8, 2013
    #2
  4. May 8, 2013 #3
    AllSeasons

    AllSeasons Bobtail Member

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    May 8, 2013
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    We basically haul garbage from NJ to OH. The weight on the loads is usually 22 tons and coming back we pick up about the same in weight. There's no trailer height requirement nor speed really. Do you think it'll make a difference in fuel economy? I don't see how it would but I've heard from others.
     
    AllSeasons, May 8, 2013
    AllSeasons, May 8, 2013
    #3
  5. May 8, 2013 #4
    Hardlyevr

    Hardlyevr Road Train Member

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    going to 22.5 will increase your engine rpms for the same speed. But a lot depends on what rear end ratio and final drive ratio the transmission has on whether it will, or how much, effect your fuel mileage.
     
    Hardlyevr, May 8, 2013
    Hardlyevr, May 8, 2013
    #4
  7. May 8, 2013 #5
    jameslawton

    jameslawton Light Load Member

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    May 1, 2013
    Tulsa OK
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    it will increase engine rpm and you will have to set your ecm to the diff tire size and change the cal on your speedo
     
    jameslawton, May 8, 2013
    jameslawton, May 8, 2013
    #5
  8. May 9, 2013 #6
    AllSeasons

    AllSeasons Bobtail Member

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    May 8, 2013
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    I know about changing the speedometer to work with the smaller tires which isn't a big thing. I don't know too much about rear end ratio and final ratio (I'm not the equipment department) but I'm going to pass on the information. Thanks!
     
    AllSeasons, May 9, 2013
    AllSeasons, May 9, 2013
    #6
  9. Jun 19, 2013 #7
    Freightlinerbob

    Freightlinerbob Road Train Member

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    Jan 15, 2012
    West Coast B.C.
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    Tire revolution per mile x diff ratio x trans final drive = RPM @ 60 MPH

    RPM / 60 x desired speed = RPM

    You will loose roughly 2 MPH for same RPM or gain 50 RPM for MPH.

    Side note:
    LP 24.5 is same diameter as 11R22.5

    You will need to buy 10 wheels.
     
    Freightlinerbob, Jun 19, 2013
    Freightlinerbob, Jun 19, 2013
    #7
  10. Jun 20, 2013 #8
    x#1

    x#1 Road Train Member

    1,773
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    Dec 24, 2009
    Cherokee County, Alabama
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    do you have in place the tires and rims or will it be an extra expense to change over? even used,aluminum wheels aren't cheap and tires,well,you already know.with five trucks,perhaps the write off will prove beneficial and a write off it will become if you change over.ask your accountant and that splits the decision down the middle.HA!
     
    x#1, Jun 20, 2013
    x#1, Jun 20, 2013
    #8
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