South Carolina Tire Regulations

SC Code § 56-5-5040 Every motor vehicle, trailer or semitrailer operated upon the highways shall be equipped with tires of sufficient size and in sufficient number to distribute the wheel loads on the road surface so as to avoid damage to the highway, and all such tires shall be in a safe operating condition. Every solid rubber tire on a vehicle shall have rubber on its entire traction surface at least one inch thick above the edge of the flange of the entire periphery. No person shall operate or move on any highway any motor vehicle, trailer or semitrailer having any metal tire in contact with the roadway. No tire on a vehicle moved on a highway shall have on its periphery any block, stud, flange, cleat or spike or any other protuberance of any material other than rubber (or other resilient material) which projects beyond the tread of the traction surface of the tire, except that it shall be permissible to use farm machinery with tires having protuberances which will not injure the highway and except also that it shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety, because of snow, ice or other conditions tending to cause a vehicle to skid. It shall also be permissible to use upon any vehicle for increased safety, regular and snow tires with studs which project beyond the tread of the traction surface of the tire not more than one sixteenth of an inch (1/16) when compressed.

Source: http://www.scstatehouse.gov/code/t56c005.php