I recall back from the days when my wife was a tire test technician for
Armstrong that the standard aspect ratio was typically a 78 series. You
may find from measurement that this ratio seems to work out to the
observed dimensions.
bjshov8@comcast.net wrote:
>These cars predate the use of section ratios in tire names. I would guess
>that standard tires back then were usually about 80 series because I remember
>when they started using the number, even some of the tires that were supposed
>to be wider were still just 75 series, and 70 series really was considered a
>wide tire.
>
>
>
>>>>>The original 145 70 tires are 21" tall.
>>>>>
>>>>>
>> The original tires were "145" but I don't think they were 70 series.
>>Just regular ol' 145x13, -not- 145/70x13.
>>
>>I have a cross reference chart that shows that 5.20-13 = 145/70-13, for
>>what it's worth.
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