Cal. Veh. Code § 39001

(a) The department shall procure and distribute bicycle license indicia and registration forms to all counties and cities which have adopted a bicycle licensing ordinance or resolution. Those counties and cities shall issue the indicia and registration form to the owner of any new bicycle, and may, upon request of the owner, issue an indicia and registration form to the owner of any bicycle which complies with Section 39007.
The department shall charge and collect a fee, not to exceed the cost of procuring and distributing the license indicia and registration form, for each bicycle license indicia and registration form issued. All fees collected pursuant to this section shall be deposited in the Motor Vehicle Account in the State Transportation Fund. Those fees are hereby continuously appropriated from the account for use by the department to defray costs to procure and distribute the bicycle license indicia and registration forms.
(b) The director shall design the bicycle license indicia and registration form described in subdivision (a), and shall establish procedures for the distribution of the indicia and registration form to counties and cities. The indicia shall be adhesive, durable, flexible, and of a size to permit it to be affixed to the front of the seat tube of the bicycle frame. Each indicia shall bear a unique license number and shall be permanently assigned to a bicycle. Each registration form shall comply with Section 39005.
(c) Bicycle licenses shall be renewed uniformly throughout the state on January 1 of the third year following the year of registration. Renewal of a bicycle license shall be indicated by a supplementary adhesive device affixed parallel to, and above or below, the indicia, with the expiration date showing.