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RE: Heat cycle for the DOT Race tires, needed or not?

To: "'AutoX'" <autox@autox.team.net>
Subject: RE: Heat cycle for the DOT Race tires, needed or not?
From: "Tharpe, Joe (RyTull Coil)" <JoeT@ryersoncoil.com>
Date: Wed, 26 Jul 2000 10:03:28 -0500
Some one said that driving on the tires (assuming street car) for at least
100 miles them putting them away for 24-48 hours was an acceptable method.
Is this one method recommended? Lets see, 100 miles, average 50 mph. 2
hours.   You just have to decide how much your time is worth I guess.  

So the consensus is heat cycling by the Tire Rack is a recommended service,
assuming you don't have time and resources to do it yourself.

What are some of the accepted "manual" heat cycling processes?

Joe T

                -----Original Message-----
                From:   Alan Pozner [mailto:AlanP@identicard.com]
                Sent:   Wednesday, July 26, 2000 9:28 AM
                To:     'solo-2@juno.com'
                Cc:     'autox@autox.team.net'
                Subject:        Re: Heat cycle for the DOT Race tires,
needed or not?

                Stephen Bernard wrote:
                >>I was talking with "Hoosier Tom" at the National Tour and
he
                >had said that Tire Racks heat cycling was just a sticker
and
                >a waste of money.... <<

                Stephen,

                TireRack is a loyal auto-x sponsor and has done a lot of
good for us. I
                strongly doubt what you write here. Please keep this kind of
opinion off the
                list.

                >My understanding is that they have to get to a certain
temperature
                >and that temp has to be maintained for a certain time along
with
                >stretching and pulling the tire ala driving hard left and
right.
                >So when you think about it an Auto-X is the perfect place
to heat
                >cycle them. A small non points event and 3 runs should do
it
                >nicely then let the tires sit for 24 hours before driving
on them.
                >Just a thought.

                I think you are wrong here as well. My understanding is that
its the gradual
                increase in temp up to operating temp followed by 24 - 48
hour cool down
                that is an ideal initial heat cycle. This allows the rubber
molecule chains
                to be gently broken and then reform and align. An auto-x
does 3 rapid cycles
                up to and possibly above the ideal temp. The resultant rapid
multiple
                breaking and reforming of bonds probably does not produce a
long wearing
                tire.

                Regards,
                Alan

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