Re: [ST] Cupping

[Matt Heyer <mattheyer@xxxxxxxxx>]

There is another, but similar mechanism, that leads to cupping.  And
this too is independent of tire type.  As you brake, you put forces on
the leading edge of the tread pattern (just like that article
describes).  As you accelerate, you put forces on the trailing edge of
the tire.  Only the rear tire actively participates in both
accelerating (obviously) and braking (either with the the brake or
engine braking).  So the phenomenon evens itself out, and you don't
generally see cupping (or as much) on the rear tire.  However, ther
front tire plays no role in accelerating, but a big role (obviously)
in braking.  Thus you only get the wear effect in one direction, and
thus cupping becomes apparent.

Again, this speaks nothing as to why some tires cup worse than others
(as you stated, could be differences in compounds, tread patterns,
etc); but it does tell you why the front experiences cupping while the
rear generally does not.

Matt Heyer

On 8/8/05, simonb@xxxxxxxxxxx <simonb@xxxxxxxxxxx> wrote:
> Quoting "Masiak, Richard" <Richard_Masiak@xxxxxxxxxxxxxxxx>:
> 
> > Matt, very interesting article.  Makes allot of sense.  However, it makes me
> > wonder if there is also another mechanism for cupping wear.
> 
> Both Bridgestones and Pilot Roads are dual compound IIRC. The Macadams have the
> wear propoerties and grip properties of Nylon :). The cupping will always be
> worse on the USA LHS UK RHS due to road camber.
> 
> 
> 
> 
> --
> SimonB
> _______________________________________________
> Triumph Sprint ST/RS mailing list
> Send list posts to ST@xxxxxxxxxxxxxx
> Change your list options at www.Triumphnet.com
>
_______________________________________________
Triumph Sprint ST/RS mailing list
Send list posts to ST@xxxxxxxxxxxxxx
Change your list options at www.Triumphnet.com