California Code, Vehicle Code - VEH § 312.5

(1) A “class 1 electric bicycle,” or “low-speed pedal-assisted electric bicycle,” is a bicycle equipped with a motor that provides assistance only when the rider is pedaling, that is not capable of exclusively propelling the bicycle, except as provided in paragraph (4), that ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour, and that is not capable of providing assistance to reach speeds greater than 20 miles per hour.

(2) A “class 2 electric bicycle,” or “low-speed throttle-assisted electric bicycle,” is a bicycle equipped with a motor that may be used exclusively to propel the bicycle, and that is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour.

(3) A “class 3 electric bicycle,” or “speed pedal-assisted electric bicycle,” is a bicycle equipped with a motor that provides assistance only when the rider is pedaling, that is not capable of exclusively propelling the bicycle, except as provided in paragraph (4), and that ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour, and equipped with a speedometer.

(4) A class 1 or class 3 electric bicycle may have start assistance or a walk mode that propels the electric bicycle on motor power alone, up to a maximum speed of 3.7 miles per hour.

(1) A vehicle with two or three wheels powered by an electric motor that is intended by the manufacturer to be modifiable to attain a speed greater than 20 miles per hour on motor power alone or to attain more than 750 watts of power.

(2) A vehicle that is modified to attain a speed greater than 20 miles per hour on motor power alone or to have motor power of more than 750 watts.

(3) A vehicle that is modified to have its operable pedals removed.