機器
accessories
bicycle
bike
black
chain
chainring
chainwheel
cog
cogs
cogwheel
component
crank
crankset
cycling
element
engine
engineering
equipment
footbeater
front
gear
gearingsystem
gears
gearwheel
hardware
iron
isolated
machinery
mechanical
mechanics
mechanism
metal
object
part
pedal
service
speed
sport
sprocket
stainless
stell
technology
transmission
transportation
treable
vehicle
wheel
white