SDCL § 32-19-13: Operation with cut or worn tire as misdemeanor--Minimum tread.

No person may operate on the public highways of this state a licensed motor vehicle which has a mounted tire having a cut into the fabric, or worn so that the fabric is visible, having knots or bulges in the sidewall or tread, or having a minimum tread depth less than two thirty-seconds of an inch on any two adjacent tread grooves. In addition, the tires mounted on the front axle of a motor vehicle of ten passenger or more capacity or exceeding a gross weight of twenty-six thousand pounds shall have a minimum tread depth of not less than three thirty-seconds of an inch on any two adjacent tread grooves. A violation of this section is a Class 2 misdemeanor.