295/75r22.5 vs 11r24.5 height , pros and cons

Discussion in 'Trucks [ Eighteen Wheelers ]' started by pavrom, Sep 8, 2019.

  1. pavrom

    pavrom Road Train Member

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    I hooked up my step deck to peterbilt and its pretty low to the ground due to peterbilt being car hauler with low leaf suspension , original tire size was 255/70r22.5 , i switched to 295/75 and still lower than with my t660 . I was wondering whats the height difference between 295/75r22.5 and 11r24.5 ? Cons and pros doing this ( climbing hills .. etc ) , is it possible finding someone who wants to go from 24.5 to 22.5 ( probably not )
     
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  3. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    24.5 is only 1" higher off of the ground than 22.5.
     
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  4. Roberts450

    Roberts450 Road Train Member

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    255’s are ruffly a 36”, the 295’s are ruffly a 40” tire, the 11r24.5 is a 44” tire. You will be loosing close to a full gear going to the taller tires. I would look at going with the tallest legs available for your 5th wheel or adding a steel riser block between the 5th wheel frame and the truck frame before going with taller tires. Easiest thing to do is put a tape measure on the 660 and get the 5th wheel height with the plate sitting level and then get the same measurement on the pete and raise the 5th wheel to match with spacers.

    And for the record your pete probably has low low air leaf rear suspension, with a 5” drop front axle as thats their normal suspension setup for car haulers.
     
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  5. 201

    201 Road Train Member

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    Good luck finding "big" rubber today.
     
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  6. Roberts450

    Roberts450 Road Train Member

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    It might be hard to find at the loves and what not but finding “big” rubber at our local tire dealers up here in the northwest anyways, is pretty dang easy.
     
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  7. pavrom

    pavrom Road Train Member

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    Will look in that for sure ...I noticed that tankers has taller legs for 5th wheel ...gonna check mine , I know for sure that I installed regular fixed 5th wheel after the trucked stopped being car hauler .
    Thank you
     
  8. Bean Jr.

    Bean Jr. Road Train Member

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    I think you mean gaining. The speed that he would do in say 12 if he has a 13 speed, he would be able to do in 11
     
  9. 201

    201 Road Train Member

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    I guess I meant good luck finding anything used. Use to be years ago, 24.5's were everywhere. Before this 2:50 ratio stuff, it was a cheap way to get a few extra mph. All the large cars had them. You could always tell a wagon that was dropped by someone with tall rubber. Lot's of "high hooks",,,
     
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  10. Roberts450

    Roberts450 Road Train Member

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    You are correct, I typed it backwards but had it figured right in my head. I hate when that happens.
     
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  11. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I run 11.24-5, never had an issue buying them. Just more expensive but you have more rubber/tread. They last longer cuz they turn less revolutions compared to low pros.
     
    Last edited: Sep 9, 2019
    Reason for edit: grammar
    Swine hauler, spsauerland and Bean Jr. Thank this.
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