[Fot] VDCA, SVRA, VRG, VSCCA Tire Rules

[Mark Cook]

Bob K,

Thanks - interesting the differences between all the "vintage"
organizations.  Those rules would rule out the Speedster since they are
40TW as well.  Seems like they could get together and unify the rules
somewhat.

Much appreciated!

Regards,

Mark

On Wed, Oct 7, 2026 at 9:11 AM Bob Kramer <rkramer56 at gmail.com> wrote:

> Mark,
>
> Here is what our TX based clubs list as tire rules for the class
> inc;using TR6's.  The 100 Minimum treadwear rating and required DOT rating
> technically disqualifies the Hoosier TDR's, but I see plenty of them around
> the paddock. Google says the TDR's are something like 40 TW. Other than
> that, the price keeps me away. I run the 225-50-15 TOYO R888s.
>
> [image: image.png]
>
> Bob
>
> On Sun, Oct 4, 2026 at 7:38 AM Mark Cook <mecook635 at gmail.com> wrote:
>
>> All,
>>
>> So, I it is time to replace my Hoosier TDRs on my TR6.  This TR6 was
>> previously run in SCCA with Hoosier R7 SM7.5 (Spec Miata).   When I
>> purchased the TR6 In 2024, then current VDCA/SVRA tire rules did not allow
>> these tires and I switched to the TDRs.
>>
>> In 2026 SVRA and VDCA changed the rules for Group 8/CP to allow
>> the Hoosier R7/R8, as well as the Toyo Proxes RR.  It appears that VRG and
>> VSCCA continue to require fully treaded tires in CP/DP classes, like the
>> Hoosier Speedster and TDR.  Though, VRG is deferring to other organizations
>> tire rules in joint events (VIR / Summit Point with VDCA as example).
>>
>> I think most of you run in VDCA Group 3, but has anyone running in Group
>> 8 CP/DP changed or considering changing to Hoosier R8s or Toyo Proxes RR?
>>
>> Thanks,
>>
>> Mark Cook
>>
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