Cal. Code Regs. tit. 13, § 1084
In lieu of the red valve stem as provided in Vehicle Code Section 27455, the valve stem of a radial tire inner tube may have the word “RADIAL” molded or stamped in letters at least 3.0 mm (0.12 in.) in height on the valve stem or on a sleeve or ferrule permanently affixed to the valve stem. The marking shall be visible when the tube and tire are mounted on a rim.
Note: Authority cited and Reference: Section 27455, Vehicle Code.
1. Renumbering and amendment of Section 1085 to Section 1084 filed 1-18-82; effective thirtieth day thereafter (Register 82, No. 4).