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Tire size question

Discussion in 'The Garage' started by chevyracing, Nov 24, 2003.

  1. chevyracing

    chevyracing 1/2 ton status

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    What is the metric equivilant size of a 31X10.5X15 tire please?

    John
     
  2. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    78.74cm X 26.67cm X 38.1cm =

    787.4mm X 266.7mm X 381mm =

    31" X 10.5" X 15"
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    My dad runs 265x75x16's (or something real similar) on his F350 and they measure 31" tall or so but I don't know the width.
     
  4. reeser

    reeser 1/2 ton status

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    the metric equivalent to a 31x10.5 is a 245/75/16. yes the 265's measure a true 31" but a 31x10.5 doesn't measure a true 31".
     
  5. Chris_T

    Chris_T 1/2 ton status

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    But that is a 16" rim.

    The mathematical conversion is something like this:

    Section width 10.5" x 25.4 mm/inch = 266.7 mm (265)

    31 inch tire - 15 inch rim = 16 inches for two sidewalls

    8 inches per sidewall x 25.4 mm/inch = 203.2 mm

    203.2 mm / 266.7 mm = 0.76 (75 aspect ratio)

    So the equivalent would be LT265/75R15 in a 15 inch tire (or a 30.6x10.4x15 if you want to split hairs)

    245/75R16 mathematically is:

    245mm / 25.4 mm/inch = 9.6"

    245mm x .75 x 2 / 25.4 = 14.7 "

    14.7" + 16" rim = 30.7" tire.

    Giving you: a 30.7x9.6x16 (or 31x10.5x16 equivalent)


    These get you close, but of course tire width and aspect ratios will vary with tire and load, etc, etc, etc. If rim size isn't a factor, either will work. You may be able to find more options in the 16" rim.
     
  6. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    Good lord... I didn't read that far into it. I was thinking more along the lines of a science project... doh.:o Chris T is on the money though.
     
  7. chevyracing

    chevyracing 1/2 ton status

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    So for my wife's Durango I need 265/75/15. Good enough, now I know what to ask for when I call around and don't gotta sound like a goober smoocher. Thanks Chris.

    John
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

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    If you are running a 15" rim then why don't you just run 31x10.5x15's?
     
  9. thezentree

    thezentree 3/4 ton status

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    you sure the durango isnt a 16in wheel? two friends of mine have durangos, and they both have 16in wheels. theyre the swept 3-spoke jobbies. /forums/images/graemlins/wink.gif
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    you sure the durango isnt a 16in wheel? two friends of mine have durangos, and they both have 16in wheels. theyre the swept 3-spoke jobbies. /forums/images/graemlins/wink.gif

    [/ QUOTE ]

    Many Durangos come with 31x10.50R15s
     
  11. thezentree

    thezentree 3/4 ton status

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    i stand corrected /forums/images/graemlins/crazy.gif
     
  12. Chris_T

    Chris_T 1/2 ton status

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    You're welcome. I don't know if 265/75 is a common P-metric size or if they just call them 31x10.5. Maybe a little online searching for the types of tires you're looking for will tell. I'm pretty sure that one of sites with the 4x4 calculators has a conversion tool for floatation to P-metric sizes.
     
  13. chevyracing

    chevyracing 1/2 ton status

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    [ QUOTE ]
    If you are running a 15" rim then why don't you just run 31x10.5x15's?

    [/ QUOTE ]

    Becuase we are looking more for a car tread tire than any kind of a truck tire. This is her work vehicle and it gets 30 miles of interstate to work and 30 miles home. I hate to go into a tire store and answer all of the questions they ask. I like to look around til I see the ones I want and say give me a set of those and leave with them. I mount and balance them myself. The ones I find that I like may not be offered in 31x10.5x15 but may be offered in the metric equivilent. How's that? /forums/images/graemlins/smile.gif

    John
     
  14. Hossbaby50

    Hossbaby50 3/4 ton status

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    Makes sense. Why don't you run BFG AT's. A compromise between both worlds of tire. Great mileage on the street and a decent offroad tread.
     

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