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The Official tire rule for The United Dirt Late Model Challenge Series is as follows:
Hoosier SPEC D21, SPEC D55, D55WRS2, American Racer Spec 48 and Spec 56, The Hoosier Spec D70 (Block Pattern) and American Racer Spec 70 are approved optional tires.
The punch rule for D21 tires is 44
The punch rule for D55 tires is 60
The punch rule for spec 48 tires is 44.
The punch rule for spec 56 tires is 60.
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