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Thread: Tire ?????

  1. #1
    79 HUSTLER
    I need help trying to figure out how to read some tire sizes. Is there a formula to convert 445/65/R22.5 to the easy way 46?x17?x22.5<--- I am just guessing on these. How do you convert the size-maybe is there some kind of chart.
    If not does anyone know the measurement of
    -445/65/R22.5
    &
    -455/55/R22.5
    Thanks for the help, KELLY

  2. #2
    YeLLowBoaT
    1st # is the tire width in MM
    2nd # is the raito of the width divide by the side wall higth.
    3rd # is the rim size.
    to go from MM to inchs its 25,4 MM per inch so for example 445 MM would be ~ 17.5 " ( take # and divide by 25.4)

  3. #3
    79 HUSTLER
    1st # is the tire width in MM
    2nd # is the raito of the width divide by the side wall higth.
    3rd # is the rim size.
    to go from MM to inchs its 25,4 MM per inch so for example 445 MM would be ~ 17.5 " ( take # and divide by 25.4)
    Damn, I was way off. I thought the first # was the tire diamater or something. Ok so the width is figured out 17 1/2" (17.51). Now I am a little confused at how to figure out the overall height of the tire. Thanks for helping me out I have been real lost on this for some time now..

  4. #4
    YeLLowBoaT
    Over all height it a little more complcated. you must figure out the side wall height take that # and add the rim size.... for example

  5. #5
    h2oski2fast
    445/65/22.5 overall tire height would be 45.25"
    455/55/22.5 overall tire height would be 42.2"

  6. #6
    h2oski2fast
    overall tire height: 445/65/22.5
    width x sidewall x 2 + rim size
    445 (width) x .65 (sidewall ratio) = 289.25
    289.25 x 2= 578.5
    578.5 / 25.4 (mm to inch conversion) = 22.77
    22.77 + 22.5 (rim size) = 45.27 (overall tire height).
    Simple math.

  7. #7
    HYPNAUTIC
    www.tirerack.com (http://)
    they have charts that can help also.

  8. #8
    sigepmock
    Try this Calculator:
    Tire size (http://www.dakota-truck.net/TIRECALC/tirecalc.html)
    Chris

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