95 D21 4x4 truck tire size adjustment

Discussion in 'Nissan Truck Forum' started by Buckster62, Jan 23, 2015.

  1. Buckster62

    Buckster62 Full Member

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    Ok here's one for you gear heads.:p My 4x4 has had larger size tires on it thus throwing off the speedometer . Ok the new ones are 30" where I believe the stock was 245/75/15 . If I can get this figured out I can a just the speedo to save me a ticket. And I would love to find my real MPG. I have tried to get a rough ideal and came up with 1/10th farther than it reads. so I have to assume the truck has more miles then it shows !!!185,000 shown now but who knows how long larger tires have been on it !

    Thanks guys:bow:
     
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  2. batty1214

    batty1214 Full Member

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    A 245/75r15 is a 29.4 inch tall tire, roughly 9 inches wide.
     
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  3. Buckster62

    Buckster62 Full Member

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    I did the mile marker thing on the interstate today and it showed I had only gone 9/10th of a mile. Where the marker showed 1 whole mile. So what's up with this ? I thought I was going farther with a taller tire ? I'm so over this MPG thing !:mad:
     
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  4. Buckster62

    Buckster62 Full Member

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    Duh I did go father ! DUH ! But I still am corn fuzzed. ( Indiana boy ) how to calculate my MPG ?
     
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  5. batty1214

    batty1214 Full Member

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    The fact that your tire is 6/10 of an inch taller than stock tire (which depending upon the brand of tire it may actually not be) your revolutions per mile are going to be very close.
     
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  6. Buckster62

    Buckster62 Full Member

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    So my MPG sucks and just live with it .LOL:wheel:
     
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  7. Buckster62

    Buckster62 Full Member

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    :wtruck:Well it beats walking .
     
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  8. MrMarty51

    MrMarty51 Full Member

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    Mile posts also vary, it takes about five miles to get a good average.
    Get a GPS unit, one with a back track setting, that will give You a very accurate indication of how far off and how much to adjust for Your MPGs.
    An app can also be down loaded that will do roughly the same thing. If You have a smarty~pants phone. I use Mine all the time.
    Smarty~pants phone is always telling Me where to go. :help: :no: :help: :rofl: :rofl: :rofl:
     
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  9. batty1214

    batty1214 Full Member

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    mine is always recalculating.
     
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