[Code of Federal Regulations] [Title 16, Volume 2] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 16CFR1203.5] [Page 218] TITLE 16--COMMERCIAL PRACTICES CHAPTER II--CONSUMER PRODUCT SAFETY COMMISSION PART 1203_SAFETY STANDARD FOR BICYCLE HELMETS--Table of Contents Subpart A_The Standard Sec. 1203.5 Construction requirements--projections. Any unfaired projection extending more than 7 mm (0.28 in.) from the helmet's outer surface shall break away or collapse when impacted with forces equivalent to those produced by the applicable impact-attenuation tests in Sec. 1203.17 of this standard. There shall be no fixture on the helmet's inner surface projecting more than 2 mm into the helmet interior.