13.3 TIRES
Any tire which is OE on a car eligible for Stock Category may be used.
Non-OE tires must meet the following requirements to be eligible for
use in Stock category:
A. The tire must not appear on the following list, which may be altered
at any time by the SEB upon notification of membership.
No tire models are currently listed.
B. No tire models will be approved for competition during the rest of
the year after April 30 of each calendar year. Each eligible tire model
must meet all requirements of Section 13.3 by April 30 and must
continue to meet them thereafter. A tire model will normally be deter
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mined by the designation in the Tire Guide.
However, any of the following changes or similar changes (as deter
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mined by the SEB) will also be considered to represent a new mod
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el for eligibility purposes, even if the designation does not change:
change of tread pattern at either full or partial tread depth; charac
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terization by the manufacturer or distributor of a tire as “new” after
April 30.
A tire model which was previously allowed by these rules continues
to be legal until specifically disallowed. This follows years of prece
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dence on eligibility for discontinued tire models.
If a manufacturer reintroduces a tire model which was previously
discontinued, that tire will be considered a new model. Therefore,
it will have to meet the rules specified in Section 13.3 including the
April 30 introduction date.
C. The model of tire must be listed in a current or previous 2 years of
the “Tire Guide” and “Tread Design Guide” or otherwise be approved
by the SEB. The tire model must have Department of Transportation
(DOT) approval.
D. Within each tire model, the sizes which are available must be equally
available to all competitors. Tire model variations differing from stan
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dard specification, delivered only on a limited basis, or only to se
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lected competitors may not be used.
E. No non-DOT racing tire or recap (on any casing) may be used. Sip
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ing or re-grooving of tires is not permitted.
F. Each tire model must be sold in at least 4 rim diameters with a total
of at least 6 sizes.
G. Tire must fit the allowable wheels and fender wells without modifica
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tion.
H. Each tire must have non-zero measurable tread depth (i.e., points
where it is possible to obtain positive measurement values) as de
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scribed in Section 3.3.3.B. Tires may not have cord visible at any
time during competition.