15 U.S.C. § 2085 : US Code - Section 2085: Low-speed electric bicycles

    (a) Construction
      Notwithstanding any other provision of law, low-speed electric
    bicycles are consumer products within the meaning of section
    2052(a)(1) (!1) of this title and shall be subject to the
    Commission regulations published at section 1500.18(a)(12) and part
    1512 of title 16, Code of Federal Regulations.

    (b) Definition
      For the purpose of this section, the term "low-speed electric
    bicycle" means a two- or three-wheeled vehicle with fully operable
    pedals and an electric motor of less than 750 watts (1 h.p.), whose
    maximum speed on a paved level surface, when powered solely by such
    a motor while ridden by an operator who weighs 170 pounds, is less
    than 20 mph.
    (c) Promulgation of requirements
      To further protect the safety of consumers who ride low-speed
    electric bicycles, the Commission may promulgate new or amended
    requirements applicable to such vehicles as necessary and
    (d) Preemption
      This section shall supersede any State law or requirement with
    respect to low-speed electric bicycles to the extent that such
    State law or requirement is more stringent than the Federal law or
    requirements referred to in subsection (a) of this section.