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Re: Kumho 225/50-14?

To: "Moore, John" <jmoore@spyglass.com>
Subject: Re: Kumho 225/50-14?
From: Mark Sirota <msirota@isc.upenn.edu>
Date: Thu, 11 Feb 1999 13:21:19 -0500
Moore, John wrote:
> Just for comparison purposes, the 225/50-15 BFG is 8.4" tread where
> the Kumho is 8.66". When talking 205/55-14, then the BFG is 7.1" and
> the Kumho is a whopping 7.64".
>
> 225/45-15 Hoosier Radial is 8.8" Tread width, 225/55-125 Hoosier
> Radial is 8.5", 225/50-15 Kumho is 8.66" and 225/50-15 BFG R1 is 8.4".

Are you comparing apples to apples?

What exactly are these numbers?  Is this the width of the tread that
touches the ground when the tire is mounted on a reference rim (how
wide?), inflated to reference pressure (how much?), and loaded with
the weight of a car (how heavy?)

Or are these just the width of the "tread pattern", regardless of how
much touches the ground?  Is it the linear width (as measured with a
ruler), or the circumferential width (as measured with a string which
can round the corner)?

Furthermore, that the tread width of a tire may be wider than another
doesn't necessarily mean that the overall tire is wider at the widest
point, which is what most people care about when they're concerned
about rubbing.

Does anyone have any real-world measurements of these tires, or can
anyone empirically determine what the tread widths on the spec sheets
actually represent?

Mark

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