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The Oil Capital Racing Series in Oklahoma is an American Racer RR only series:
SECTION III. TIRES
OCRS specified RIGHT REAR tire for all OCRS sanctioned events is the American Racer 102-16-0-15GT stamped “OK Medium" or the American Racer 102-16-0-15GT stamped (RSCS) D-36 (Hard). This is the only right rear tire to be used in any OCRS event. All other tires brands and/or compounds optional on other three corners. All Tires subject to durometer testing at any time. All tires must meet the durometer specifications within 5 points.
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