Henry Frye wrote:
>
> At 10:39 AM 6/6/00 -0500, Jim Hill wrote:
>
> >2) Doesn't the answer to Cary's question have something to do with what
> >vintage racing association he plans to run with?
>
> I think Jim's statement here answers it all.
>
> My limited knowledge of SVRA rules tells me that Cary's car could run in
> Group 10, the group that is the "catch all" of cars that don't meet their
> strict criteria.
>
> The following text is from the SVRA website:
>
> SVRA Group 10 Detailed Rules
>
> 1. Eligibility: Select GT Sports cars and Sedans as raced after 1972. All
> cars must have been built or modified to compete in a recognized racing
> series. Exceptions must have specific approval in advance of entry
>application.
> 2. Modifications: As listed in the SVRA General Rules and Regulations and
> as appropnate for the make and model as it competed in a recognized racing
> series during this period. It is the responsibility of a competitor to
> provide documentation for any specification that is not generally
> considered appropriate.
> 3. Tires: Appropriate sized slicks or treaded tires. Certain "series" cars
> and classes may have a specific list of spec tires. These will be listed on
> a Supplemental Regulation for that class.
> 4. Classes: Due to the newness of this group, there will be a certain
> amount of experimentation with the class structure.
>
> --- end of SVRA text.
>
> >My own feeling (worth precisely zero) is that an authentic, documented
> >vintage race car should NEVER have to be 'un-modified' in order to
> >participate in vintage races.
>
> This probably was the thinking behind Group 10...
> Henry Frye thefryes@iconn.net
> http://members.iconn.net/~thefryes/amici.html
> http://members.iconn.net/~thefryes/rollbar.html <-- Pictures of the new
> rollbar
> TR4 apart again!
The answer is that flares started in the early 70's on production cars.
The SCCA tried to control the width of the tire patch by controlling the
rim width. However, clever racers, of which there were many, realized
that there were ways to skin that cat and that was to use a cantilevered
tire, i.e., one that would fit on a narrow rim but still yield a 10"+
(width) footprint, hence the need to flare. Today, you cannot find a
cantilevered tire, and in many cases the Hoosier or Goodyear that is
available is as much as 3/4" narrower than the tire available in the
early seventies. However, the technology is so much better that these
"vintage tires" are better than the race tire available back then,
albeit slightly narrower. Bill Warner
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