Because they're already hard?
If soft is 1 and hard is 10, slicks may be 1 to start with and DOT gumballs
may be 2, so you really notice when they get to 10. Your high treadwear
street tire, however, may start life at 8 so the move from 8 to 10 is hardly
noticeable.
People ask me if the Formula V Traction Treatment I sell works on street
tires. The answer is yes, but the improvement from 10 to 8 is not as
noticeable as the improvement from 10 to 2. (FVTT is not a softener -- it is
a restorative/preservative intended to keep tires at the original compound
softness).
Heat cycling (also aging and sunlight exposure) will harden any tire. But if
the ratio from new/soft to old/hard is relatively small you hardly notice
it. The ratio is greater on softer performance (short-life) tires.
--Rocky Entriken
----- Original Message -----
From: "Randall Young" <Ryoung@navcomtech.com>
To: <fot@autox.team.net>
Sent: Sunday, November 30, 2003 9:16 PM
Subject: RE: Interesting tire info
> > I got curious about why initial heat cycling is important after I
> > admitted I
> > didn't know why it was important--I generally can't tolerate that
> > situation
> > for long. After a little research I found this rather interesting site:
>
> Thanks again, Bill.
>
> Given that I only drive on the street, anyone care to theorize over
whether
> a tire with a somewhat higher treadwear rating would be less prone to
> getting hard through heat cycling ?
>
> Anyone try the Kumho ECSTA Supra 712 ?
>
> Randall
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