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Hi Mark. I've been using the Hoosier TDRs for years on my Spit and all
groups accept them. This year, I had, what turned out to be a mounting
problem, with a fresh set of TDRs and I needed tires ASAP after the K Cup
so I bought a set of Toyo Proxies R888R (full width tread tires). Again,
these are allowed with every racing group. They have a smaller diameter
than the TDRs which helped me in the boot at the Glen but not so much on
the straights. I've sorted out the mounting problems with the TDRs so I
plan on a back to back comparison next weekend at Thompson to see what
works best there (slower track, probably the Toyos).
Our racing group, HRG, allows the R7s and similar tires at every event
except our joint weekend at the Glen with VRG. That's the one VRG event
(out of 3 last year) where HRG tire rules were not allowed.
mike h
On Tue, Oct 6, 2026 at 12:34=E2=80=AFPM Mark Cook <mecook635@gmail.com> wro=
te:
> Just following up on my earlier email to see if anyone has thought about
> the tire rules and my question below.
>
> Thanks,
>
> Mark Cook
>
> On Sun, Oct 4, 2026 at 8:21=E2=80=AFAM Mark Cook <mecook635@gmail.com> wr=
ote:
>
>> 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 all=
ow
>> 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 a=
nd
>> VSCCA continue to require fully treaded tires in CP/DP classes, like the
>> Hoosier Speedster and TDR. Though, VRG is deferring to other organizati=
ons
>> 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
>>
>> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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<div dir=3D"ltr">Hi Mark. I've been using the Hoosier TDRs for years on=
my Spit and all groups accept them. This year, I had, what turned out to b=
e a mounting problem, with a fresh set of TDRs and I needed tires ASAP afte=
r the K Cup so I bought a set of Toyo Proxies R888R (full width tread tires=
). Again, these are allowed with every racing group. They have a smaller di=
ameter than the TDRs which helped me in the boot at the Glen but not so muc=
h on the straights. I've sorted out the mounting problems with the TDRs=
so I plan on a back to back comparison next weekend at Thompson to see wha=
t works best there (slower track, probably the Toyos).<div><br></div><div>O=
ur racing group, HRG, allows=C2=A0the R7s and similar=C2=A0tires at every e=
vent except our joint weekend at the Glen with VRG. That's the one VRG =
event (out of 3 last year) where HRG tire rules were not allowed.</div><div=
><br></div><div>mike h</div></div><br><div class=3D"gmail_quote gmail_quote=
_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Oct 6, 2026 at 12=
:34=E2=80=AFPM Mark Cook <<a href=3D"mailto:mecook635@gmail.com";>mecook6=
35@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div>Just following up on my =
earlier email to see if anyone has thought about the tire rules and my ques=
tion below.</div><div><br></div><div>Thanks,</div><div><br></div><div>Mark =
Cook</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Sun, Oct 4, 2026 at 8:21=E2=80=AFAM Mark Cook <<a href=3D"m=
ailto:mecook635@gmail.com" target=3D"_blank">mecook635@gmail.com</a>> wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D=
"ltr"><div>All,</div><div><br></div><div>So, I it is time to replace my Hoo=
sier TDRs on my TR6.=C2=A0 This TR6 was previously run in SCCA with Hoosier=
R7 SM7.5 (Spec Miata).=C2=A0 =C2=A0When I purchased the TR6 In 2024, then =
current VDCA/SVRA tire rules did not allow these tires and I switched to th=
e TDRs.</div><div><br></div><div>In 2026 SVRA and VDCA changed the rules fo=
r Group 8/CP to allow the=C2=A0Hoosier R7/R8, as well as the Toyo Proxes RR=
.=C2=A0 It appears that VRG and VSCCA continue to require fully treaded=C2=
=A0tires in CP/DP classes, like the Hoosier Speedster and TDR.=C2=A0 Though=
, VRG is deferring to other organizations tire rules in joint events (VIR /=
Summit Point with VDCA as example).</div><div><br></div><div>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?=C2=A0=C2=A0</div=
><div><br></div><div>Thanks,</div><div><br></div><div>Mark Cook</div><div><=
br></div></div>
</blockquote></div></div>
_______________________________________________<br>
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/a><br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
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</blockquote></div>
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