S.D. Codified Laws § 32-22-22 (2026)
"Tire width," when applied to pneumatic tires, shall mean the diameter of the cross-section of such tires as customarily measured and rated by the manufacturers of motor vehicles and tires.
Source: SDC 1939, § 44.0336 (6) (e) as added by SL 1943, ch 158 , § 2; SL 1947, ch 192 ; SL 1953, ch 234 ; SL 1957, ch 223 , § 2; SL 1959, ch 260 , § 2.