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Changing tire size...

Discussion in 'Ask An Owner Operator' started by Babyboy1968, Sep 10, 2023.

  1. Sep 10, 2023 #1
    Babyboy1968

    Babyboy1968 Bobtail Member

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    Sep 10, 2023
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    My question to the truckers out there is I have 3.90 rears .285/75 22.5 tires wanting to go to 11R22.5 .how much of a drop in gear will this give me.looking for better fuel mileage.currently getting 6 mpg.s. I do have 11R 22.5 on the front.12.7 Detroit 60 series
     
    Babyboy1968, Sep 10, 2023
    Babyboy1968, Sep 10, 2023
    #1
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  3. Sep 10, 2023 #2
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    AModelCat, Sep 10, 2023
    AModelCat, Sep 10, 2023
    #2
  4. Sep 10, 2023 #3
    snowwy

    snowwy Road Train Member

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    The fronts won't matter since they have no ties to the power train.

    Have you verified your odometer accuracy to a GPS app? Your odometer and speedo might be reading a little higher then GPS. Causing you to rack up more miles then actual.

    I could be wrong but the truck may have originally came with hi pros. Instead of low pros.

    Only time I've seen low pros is on drop axles.

    Others may have seen different though.
     
    snowwy, Sep 10, 2023
    snowwy, Sep 10, 2023
    #3
  5. Sep 10, 2023 #4
    abyliks

    abyliks Road Train Member

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    ludlow MA
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    What’s the door tag say? I’d be surprised if someone geared the truck that short on low pros and not 11 or 12 22.5s but people do weird sht sometimes, 3.90s are about perfect with 11 24.5s though and a rtlo trans
     
    abyliks, Sep 10, 2023
    abyliks, Sep 10, 2023
    #4
    North Pole Nightmare Thanks this.
  7. Sep 12, 2023 #5
    Rideandrepair

    Rideandrepair Road Train Member

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    Probably close to a 370. Check the calculator
     
    Rideandrepair, Sep 12, 2023
    Rideandrepair, Sep 12, 2023
    #5
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