[s-cars] RE: S-CAR-List Digest, Vol 7, Issue 98 - 17" tire size ideas

[Trevor Frank]

I don't know of an r series tire that will last 10X track events on our
cars, but if you do let me know.

-----Original Message-----
From: Larry C Leung [mailto:l.leung at juno.com]
Sent: Thursday, May 20, 2004 3:32 PM
To: s-car-list at audifans.com
Cc: Trevor Frank; mlped at qwest.net
Subject: Re: S-CAR-List Digest, Vol 7, Issue 98 - 17" tire size ideas


Well, some of these are true track rubber, some of these are more
of a hyperactive street tire. I usually support separate track/street
tires, because, in the long run, it actually costs less to run that way.

Since 17" street tires aren't really inexpensive, you'll really want to
get the 30K or so miles out of 'em they're generally capable of. Track
tires cost about the same, but with shaving and heat cycling (VERY
important for track tire life for a heavy car such as the UrS or even,
perhaps a pony car ;-) they'll last much longer than full tread street
tires doing the same job. The difference lies in the performance of
the track tires and near track (street) tires although I don't have any
practical
experience on the wear life of the near track tires. Note, some of these
tires will live MUCH longer if the car has a TON (i.e. 1.5 degrees or
more!) negative camber, and they'll react better too. General rule,
square shoulder tires will NEED a lot of negative camber, but will
likely grip/turn in better. This is my take, although I haven't run on
a number of these tires since the demise of my ex-Solo2 GTi....

IMHO....(my $0.02)


> Date: Thu, 20 May 2004 12:43:20 -0600
> From: "mlp5" <mlped at qwest.net>
> Subject: RE: [s-cars] 17" tire size ideas
> To: "'Trevor Frank'" <tfrank at symyx.com>,        "'marc weiner'"
>         <marcweiner at comcast.net>, s-car-list at audifans.com
> Message-ID: <000001c43e9a$537d9000$0300a8c0 at mpd530>
> Content-Type: text/plain;        charset="us-ascii"
>
> I think the better answer is probably to set up a designated set of
> wheels
> with track tires.  After doing this two weekends in a row, I can see
> that
> it's a little unreasonable to expect that the same tires you expect
> to take
> you home, reliably, ought to be subjected to the kind of abuse a UrS
> car,
> especially if equipped with a good set brakes, can potentially dish
> out over
> the course of a day. 
>
> So, who's got the pro's and cons for either:
>
>  - Kuhmo VictorRacerV700  -   Reasonable for a car without a true
track
alignment. A true
                                                        Race tire, but
old design. Very forgiving. Not availible in
                                                        all sizes.

- Kumho Ecsta V700 - Racier (faster) than the Victoracer, needs lots of
negative camber, or they'll
                                        blister.  Not availible in all
sizes.

> - Michelin Pilot Cup - No experience, but big $$$$$.
>  - Falken Azenis - super sticky street tire - probably the closest to
a
track tire of a street tire
                                I've driven, much of the good feel with
better wear. Other runners in STS
                                seem to feel that the Pilot Sports are a
bit better performing, but nearly twice
                                the price. Again, this is a street tire,
not an R-rubber tire.

>  - Hoosiers - Excellent race tire, BUT, require an absolute TON of
negative camber or they'll
                             likely self destruct. On lighter cars (such
as my GTi) they need 2+ degrees of
                             negative camber, on a heavy rolling super
pig, I doubt you'll ever get enough
                             negative camber to ever get them to hook up
properly. They're VERY light
                             and have soft sidewalls, so they'll only
survive with LOTS of pressure which
                              will load up the outer shoulder. When the
outer shoulder is that overloaded,
                             they're is a risk of enough heat build up
to
blister, and a light carcass will heat
                             quickly. Heck, I managed to blister Yok
A008Rs (way, WAY back when)
                             on a 2200 lb solo car (driver/fuel
included) when I had to run them at 50 psig.

                              They wear out quite quickly, in either
compound.

- Bridgestone ? NLA in R compound type tires (RE-71RAZ, stunk anyway,
except in rain)

>  - BFG Comps TA-R (NLA, BFG is out of the R-rubber business. What's
availible are
                             leftovers, and they're not discounted much
anyway

>-Yokohama 032R - Really more of a super street tire rather than a true
R
compound tire. Not
                        worth the effort, the newer Falken Azenis are
better street tires. The 032s and nowhere near an R-rubber tire.
>-Yoko Advan 048 - Probably a heck of a near R rubber tire, BUT - check
availible sizes,
                        probably quite limited.

- Other's to consider

        Toyo Proxes - RA-1 - true race rubber - exclusive race rubber
for
SpecMiata. No experience

Teddy has a worthwhile comment however. Unless you are actually
competing, go for bang
for the buck.


>
>   http://members.rennlist.com/944sandmore/traktire.htm
>
> >-----Original Message-----
> >From: Trevor Frank [mailto:tfrank at symyx.com]
> >
> >I bought the HTRZ II's and thought initially they where
> >descent track tires, after one event in the rain.  At the
> >second event I got a dry track and they chunked up really bad
> ......

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