Gear ratio

Discussion in 'International Forum' started by Battleship, Jan 10, 2018.

  1. Battleship

    Battleship Bobtail Member

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    Jan 10, 2018
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    I'm looking at buying a brand new log picker truck because the old new 2005 just blew the cummins isx at 42000 hrs.
    I know in Ontario it's 105 km/h governed
    I was wondering with 22.5 tires how slow of a gear ratio you'd need to be doing 1800-2000 rpms at 105 in 8H.
    Ratios have to be slow anyway because we are regularly grossing 5-10% over 63500kg running northern Ontario.

    with 4:10s you can't get 8H over 1500 rpm before getting governed and we like running 1800 rpms ish at 105.
     
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  3. Oldironfan

    Oldironfan Road Train Member

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    So maybe you need 4.33 axle gear I think.
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    Eaton Fuller road speed calculator. Put in your numbers.
     
  5. Battleship

    Battleship Bobtail Member

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    So it turns out...with 22.5 tires just above 1800 rpm at 105 km/h, I need 4.56 gears...
     
  6. Oldironfan

    Oldironfan Road Train Member

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    That's odd. But I use mph.
     
  7. Battleship

    Battleship Bobtail Member

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    It goes 65.1 mph AT 1800 which is 104._____ kph
     
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