A bicyclist propelling a bicycle may not ride other than upon or astride a permanent and regular seat attached to the bicycle. No bicycle may be used to carry more persons at one time than the number for which it is designed and equipped.
Manner of riding bicycles; number of persons which may be carried
S.C. Code Ann. § 56-5-3440, under Title 56, Chapter 5.
S.C. Code Ann. § 56-5-3440