Tyres sizes

["Dave Wilker" <wilkerbeast01@xxxxxxxxxxx>]

Mel~
  In the good old days, all you needed was the width (9.50 or "nine and a
half inches") and the rim diameter (14 inches) Sometime in the '60s, they
started using "aspect ratios", and metric measurements, where the width of
the tyre from sidewall to sidewall (235 MM, for example) was multiplied by
the aspect ratio ("78" would mean 78%, 70 is 70%, 60 is 60%, etc) and the
rim size (Still measured in inches, usually)
David C. Wilker Jr,
USAF (Ret)

From: "Mel Wyshynski" <mvwyshy@xxxxxxxxxxxxxxx>
Subject: IML: Tires
Date: Sat, 20 Dec 2003 07:26:18 -0600
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 Hello All

 I note that one of the tire sizes offered for 1959 was 9.50 X 14.
 This omits the second number which is the height of the tire as a =
 percentage of the width.
 There must have been a standard at that time. I recall something about =
 the number 78 but???
 Would someone clarify this for me please.
 Thank you.

 Mel