Tire Size debate

Discussion in 'OT Driven' started by Fareo, Jun 10, 2005.

  1. Fareo

    Fareo New Member

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    my buddy and i are having a debate about how to read a tire and i told him it reads like this ..

    (example) 265/70/16 is 265mm wide/ 70% of 265mm/ and rim size 16

    hes telling me that the serise number is static or is always the same.. like a 205/40/16 has the same size side wall as a 295/40/16.

    i know hes wrong ive talk to a tire shop and eveyone i know.. and even Goodyears website says thats the formula*.


    do you guys have any hard evidence or a know of a site that would prove his ass wrong once and for all???

    *http://www.goodyeartires.com/kyt/readingATire/
     
  2. P07r0457

    P07r0457 New Member

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    by my calculations, a 265/70R16 has the same sidewall as a 370/50R16 (7.3in) Now a 370/50R16 is an impossible size, but it illustrates quite well, that although both tires have a different aspect ratio, they have the same "sidwall" size.
     
  3. P07r0457

    P07r0457 New Member

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    Maybe a better comparison is:

    215/50R16 -- 4.2in sidewall
    275/50R16 -- 5.4in sidewall
    275/50R18 -- 5.4in sidewall

    Showing that Radius of rim does not affect sidewall, but the width does.
     
  4. AcidAngel_5.0

    AcidAngel_5.0 Pure 0wnage

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    your right, hes wrong.. tell him to go suck an egg
     
  5. syP

    syP OT Supporter

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    umm... the "40" DOES represent the same sidewall..
     
  6. Ivy Mike

    Ivy Mike New Member

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    yes, it means it is roughly 40% as tall as it is wide.

    265mm wide
    70% as tall as it is wide
    rolling on a 16" wheel.

    www.tires.com also has a few good calculators and converters.
     
  7. Y2kAccord

    Y2kAccord Everything happens for reasons I just dont know

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    you are right
     
  8. matrix243

    matrix243 My body, is ready.

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    not much to prove. the width dictates the sidewall height. if the width remains the same, the sidewalls does also.

    fyi, x2 on the sidewall calc. for overall height.
     

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