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Tire size conversion

Discussion in 'The Garage' started by sickquad, Nov 12, 2004.

  1. sickquad

    sickquad 1/2 ton status

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    Anyone have a tire size conversion from the LT sizes. I know there is a chart floating around somewhere, haven't found it yet though.

    Also, what is a LT tire versus a tire which just gives inch dimensions for there size. Is it just a different designation of size?

    -Chris
     
  2. m j

    m j 1/2 ton status

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    285-80r16
    285 is section width in milimeters
    80 is the aspect ratio, side wall hieght in relation to section width
    r is radial
    16 is rim diameter
    285mm x 80% x 2 + 16" = tire hieght of 33.95"

    is that what you were asking?
     
  3. pauly383

    pauly383 Daddy383 Staff Member Moderator

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  4. dremu

    dremu Officious Thread Derailer Premium Member

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    [ QUOTE ]
    Anyone have a tire size conversion from the LT sizes. I know there is a chart floating around somewhere, haven't found it yet though.

    Also, what is a LT tire versus a tire which just gives inch dimensions for there size. Is it just a different designation of size?

    -Chris

    [/ QUOTE ]

    Think you're confusing LT for P-metric.

    An LT tire is a "light truck" tire as opposed to a P-series "passenger car" tire. Usually means stronger tire, higher capacity, and/or more aggressive tread.

    P-metric or metric tire sizes are just stupid. First numebr is tread width in mm, next is a ratio of sidewall to tread, and last is the wheel diameter in inches.

    A 265/75-16 is therefore 265mm wide (~10.5") by 31.6" (2 x .75 x 265mm + 16 = ~31.6") in diameter on a 16" wheel. More or less a 32x10.50x16 in the olden days.

    Anyway, you can get stupid size tires that are P and stupid size tires that are LT, so the LT designation isn't just to do with size, as it also implies type.

    HTH.

    -- A
     

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