Date: Sun, 2 Oct 2005 22:20:14 -0600
Reply-To: Bob Stevens <mtbiker62@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Bob Stevens <mtbiker62@HOTMAIL.COM>
Subject: Re: On weight
Content-Type: text/plain; charset="iso-8859-1"
My fronts wear faster than my rears too, Jake. The thing that's not being
taken into consideration in your assessment is the effect on the rear tires
of those lateral forces and weight of the van that start all that weight
moving toward the outside of the turn. What does that do to the rear of the
van ... and the tires back there. The fronts only start this momentum. The
rears have to stabilize it. At least that's my reasoning in this. I "think"
the higher inflation in the rear cuts down on effects of dynamic lateral
weight/oversteer forces.
... and, back to the question: why are the rears inflated higher than the
fronts if more stress and pressure is applied to the fronts, given that the
static weight of the van is not biased, or biased toward the front when
loaded? wassup wit dat?
bob
----- Original Message -----
From: "Jake de Villiers" <crescentbeachguitar@telus.net>
To: "Bob Stevens" <mtbiker62@HOTMAIL.COM>; <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, October 02, 2005 10:03 PM
Subject: Re: Re: On weight
> I'm going to have to disagree Bob. The front wheels turn at an angle
> to
> the direction of travel, thereby stressing the front sidewalls to a far
> greater degree than the rears. The fronts are also worked a lot harder
> under
> braking, and especially when braking and turning at the same time.
> Any reasonably powered road race car will use up front tires at a much
> faster rate than rears. It is only live axle V8 sedans that run out of
> rear
> tire first.
> And obviously, on a Vanagon, the rear tires aren't being spun very
> often! :-) Jake
> ----- Original Message -----
> From: "Bob Stevens" <mtbiker62@HOTMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Sunday, October 02, 2005 8:44 PM
> Subject: Re: On weight
>
>
> > "So why, invariably do the tire inflation specs have higher pressure to
> > the REAR on Vanagons?"
> >
> > my $0.02
> > It's mostly dynamics because of the effects of momentum and inertia on
> > the
> > weight of the van while moving, along its length. Although the front
> > sidewalls "roll" when the van turns, because of lateral oversteer
> > characteristics inherent in that, the rear sidewalls have more lateral
> force
> > on them than the fronts. Higher air pressure stiffens the sidewall to
> better
> > deal with that force.
> >
> > bob
> >
>
>
>
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