Section 27501 Of Article 4. Tires From California Vehicle Code >> Division 12. >> Chapter 5. >> Article 4.

. (a) No dealer or person holding a retail seller's permit shall sell, offer for sale, expose for sale, or install on a vehicle for use on a highway, a pneumatic tire which is not in compliance with regulations adopted pursuant to Section 27500. This subdivision shall not apply to any person who installs on a vehicle, as part of an emergency service rendered to a vehicle upon a highway, a spare tire with which such disabled vehicle was equipped.
  (b) No person shall use on a highway a pneumatic tire which is not in conformance with such regulations.