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

[Theodore Chen]

--- Larry C Leung <l.leung at juno.com> wrote:
> 
> 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.

yes, dedicated tires make more sense.

FYI, i've run kumho V700s at full tread depth.  they don't have much of
a tread pattern, so they become slicks very quickly, and chunking has never
been a problem.  they won't be as fast at full tread depth as if they were
shaved, but eventually they'll get to that point.  they don't lose much
grip over multiple heat cycles.

speaking of heat cycling, i just buy the tires and put them on the car for
a freeway blast.  take a couple of corners at speed to scrub in the tires,
and let them sit for 24 hours.

i haven't tried running RA-1s yet.

> 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.

they all will, and -1.5 degrees camber isn't a lot.  mustangs typically
have about -3 degrees for the track.

strut suspensions have relatively poor camber curves, so you have to set
them up with more static negative camber.

miatas have double A-arm suspensions, but still run -2 degrees of camber
in spec miata (which is the maximum allowed by the rules).

you bring up a good point, though.  in my experience, hoosiers are
VERY intolerant of poor camber.  get your camber set up well and/or
check tire temperatures with a pyrometer, or you'll turn your front
hoosiers into scrap in a day.

-teddy



	
		
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