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

[Mark Cook]

Yep, they are UTQG 40

[image: image.png]


On Wed, Oct 7, 2026 at 7:21 PM Bob Kramer <rkramer56 at gmail.com> wrote:

> Mark,
>
> I didn’t realize that Speedsters were
> 40 TW rating tires. Years ago I ran them when 60 series were required but
> they too hot no pricey. I do remember wearing out a new right front  in one
> weekend.
>
> You only get one chance at life, make it a TRIUMPH.
>
> On Oct 7, 2026, at 4:48 PM, Mark Cook <mecook635 at gmail.com> wrote:
>
> 
> 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.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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