Not Ranked
This issue came up last year and there is a clear advantage to running slicks over Billboards. However, since the Billboards are grooved (even though they do not have a DOT rating) they are classified as a Prepared Class tire. Slicks are considered PRO class tires. This is the only exception that I know of because all other DOT tires are either above the 200 wear rating (Street Class) or 199 and below wear rating (Prepared Class).
Clois
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