英文關鍵字
eccentric
puller
bearing
balls
rear
wheel
hub
ball
unscrews
bicycle
chain
gear
mountain
bike
mechanism
component
gearshift
repairman
fixing
repairer
wrench
serviceman
detail
maintenance
cassette
cycle
repair
service
lifestyle
biking
mechanic
occupation
sport
tire
closeup
equipment
fix
job
help
workshop
work
business
man
professional
employee
transportation
technology
derailleur
removes
boot
front
takes
screwdriver
close-up