RE: Re: re:Tire Sizes - Help for the math impaired

[dsedon@domain.elided]

yup alex, yure right - at an indicated 70mph, you'll be goin' ~68.7.  not too bad, & considering that 185-70-14's could vary as much as half an inch from mfr to mfr anyway, yure well w/in the range of tolerence.  mite be worthwhile to contact the mfrs if yure really concerned enuff about this to try & get the tallest tire...  but, i'd yust go for the stickiest one in my price range, & not worry about it. :>)

doug s.

"Csank" <csank@domain.elided> wrote:

>OK Dug,
>
>So, the 165/80-14 has a width of 165mm and a sidewall height of .80 x 165mm,
>which is 132mm.  Multiplying by two gives 264mm.  Dividing that by 25.4
>gives 10.4.  Added to 14, this is 24.4"...right?
>
>The 165/82-14 (as noted by Carl Newcomb) has a width of 165mm and a sidewall
>height of .82 x 165mm, which is 135.3mm.  Multiplying by two gives 270.6mm.
>Dividing that by 25.4 gives 10.65.  Added to 14, this is 24.65"...right?
>
>And the 185/70-14 has a width of 185mm and a sidewall height of .70 x 185mm,
>which is 129.5mm.  Multiplying by two gives 259mm.  Dividing that by 25.4
>gives 10.2.  Added to 14, this is 24.2"...right?
>
>So, whatever way you cut it...the calculators are right...and Paul Mitchell
>was wrong.  The 185/70-14 sizing pretty closely proximates the original
>165-14 size (certainly more than we were led to believe) as found on many of
>the 105 series cars with the ATE brakes (1969 - 74 approximately).
>
>> multiply the width of the tire by the aspect ratio w/a decimal point in
>front, to get the height of the sidewall.  ie:  my 225-50-15 has a width of
>225mm. it has a sidewall height of 0.50 x 225mm, which is 112.5mm.
>>
>> as the total diameter of a tire includes *two* sidewall heights, yust
>multiply that by two; then convert it to inches by dividing it by 25.4.  so,
>the 112.5 times 2 goes back to 225; divided by 25.4, it's 8.86".  add this
>to the 15" diameter & ya get the total tire diameter of 23.86"
>>
>> hth,
>>
>> someone e.
>
>
-- 




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