repair of an old electric bike. dirty and old bicycle chain covered with rust close-up. professional workshop

bicycle gear bike chain wheel repair service mechanic workshop cycle fix tool work maintenance part repairman hand mountain fixing biking professional profession business cyclist repairer derailleur garage bicycling occupation biker installing technician detail frame industry store transportation old cassette spoke ratchet bushing axle motor electric rust hanger type freehub freewheel bike dirty covered close-up