Some of us don't see them as accessories but rather as necessities.
12v rechargeable bicycle battery
Front & rear signal lights
Brake & tail lights.
High & low beam head light.
Reflectors
High & low volume duel horn.
Bicycle computer
Techometer/hour counter
Handlebar mirrors
Cellphone holder
Cellphone charger
Keyed Cable & keyed U locks
Bicycle pump
See through 5 quart gas tank
Bicycle helmet with light
Glasses cam
Side basket
lockable tool box
Shift kit
Auto shifter (shifts 7 gears automatically)