Hi Larry,
Because there is more flexing of the side walls.
You get a larger flat bit on the bottom and more
rolling resistance. One can counteract this by
increased tyre pressures, but the pressure needs
to go up quite a lot to compensate for the taller
side walls.
But it is all just a matter of degree and
compromise. And personal preference!
Guy
-----Original Message-----
From: Larry Daniels
[mailto:ladaniels@sbcglobal.net]
Sent: 10 January 2008 14:47
To: Guy Weller
Cc: spridgets@autox.team.net
Subject: Re: [Spridgets] No real difference in
tires
Guy, why would a taller aspect ratio produce more
rolling resistance?
Larry Daniels
----- Original Message -----
From: "Guy Weller" <guy.weller@tiscali.co.uk>
To: "'Chris King'" <cbking@alum.rpi.edu>
Cc: <spridgets@autox.team.net>
Sent: Thursday, January 10, 2008 5:58 AM
Subject: Re: [Spridgets] No real difference in
tires
Chris,
You are correct about tread width; wider does have
more rolling resistance.
But I was only talking of the aspect, or tyre wall
height, not the width. I made no mention of the
tyre width.
Guy
-----Original Message-----
From: Chris King [mailto:cbking@alum.rpi.edu]
Sent: 10 January 2008 11:43
To: guy.weller@tiscali.co.uk
Cc: spritenut@comcast.net;
spridgets@autox.team.net
Subject: Re: [Spridgets] No real difference in
tires
Greater rolling resistance? I thought a skinny
tire, with a small aspect ratio, would have less
rolling resistance.
Why would this be an incorrect thought?
Agree with you on cornering and poor handling of
80 series tires.
All other things being equal, skinnier tires are
better in snow as well, as they tent to track
straighter and not slip sideways as much. Just
look at the width of the tires on WRC cars in the
snow stages.
-=Chris
Chris King
http://home.comcast.net/~kvcbk/
<-----Original Message----->
From: Guy Weller [guy.weller@tiscali.co.uk]
Sent: 1/10/2008 6:11:19 AM
To: spritenut@comcast.net;spridgets@autox.team.net
Subject: Re: [Spridgets] No real difference in
tires
Another angle on this is that the taller sidewall
tyres - that is the 80
aspect ration tyres - will deform more on
cornering and will also
generally have a greater rolling resistance. This
reduces acceleration,
increases fuel consumption and gives poorer
handling on twisty roads.
Generally all bad points. They do, however give a
slightly softer ride.
Guy
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