I have an Expedition, the larger version of the
Exploder. It came with "C" rated Goodyears, I had them
changed right away to "D" rated Goodyears. The ride is
a little rougher (my wife never noticed) but the
handling was much better. The firmer sidewalls cut
aloy of the sway down. I wore those out at about 38k
miles and just put on a set of Pathfinder "D" range
tires. A little less aggressive on the tread pattern
but a little better sidewall. Handles even better now.
Just got done with a camping trip that we pulled a 26'
trailer on. I would have never done it on the "C"
rated tires. The truck would have been all over the
road.
MHO
Don Miller
69 Turbo V-6
Meridian, ID
--- svgkm@halley.ca.essd.northgrum.com wrote:
> Maybe some of the racer/gurus out there can speak
> more definitively on this subject, but
> it seems to me that softer tires would exacerbate
> the tendency to roll - based on this
> line of logic: The high CG placement of these
> vehicles means there is a longer moment arm
> between the center of mass and the tire contact
> patch; the large mass acting through this
> distance results in a large (and aptly-named)
> overturning moment. Any increase in
> flexibility in the structures (suspension, that is
> shocks/struts, and tires) that resist
> this overturning moment results in higher deflection
> angles; that is - greater
> displacement of the CG from center and a greater
> tendency to ROLL OVER!
>
> It is exactly the combination of high CG, large mass
> and soft suspension that makes SUVs
> so roof-happy, especially in avoidance maneuvers at
> speed, when a high rate steering input
> combined with the vehicle's velocity create very
> high forces acting against the cushy
> suspension systems these vehicle are typically
> equipped with. The sudden inputs required
> to correct for a blown tire are an example of what
> to do if you want to put your typical
> SUV on it's roof. If it were me, I'd crank the
> pressure up to reduce tire body heating on
> my way to the tire store to buy some Michelins...
>
> Gay McCormick
> San Jose, CA
>
> Pamela Pepoy wrote:
>
> > [snip] However,
> > Ford says to only inflate them to 30 psi (soft to
> avoid the Explorer's
> > inclination to tip over and roll). Firestone says
> to inflate them to 35
> > psi to stop them from heating up and peeling off
> like a bannana skin and
> > also causing the Explorer to roll. So, my NEW,
> SAFE family vehicle is
> > an unsafe, certified turkey.[snip]
> > Guy
> > 67.5 SPL311
> > Tempe, AZ
> >
> > --------------42B278C8638BE7302B0EB185--
>
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