repair of mountain and road bikes. mechanic's hands and a cassette close-up on a black background.

background bicycle bike bikes biking black brake broken cassette chain circle close-up closeup component crash cycle cycling cyclist detail drive equipment fix freehub freewheel gear gearwheel group hand hands lifestyle machine mechanic's metal mountain mtb object old part parts repair replacement ring road service spare speed sport sprocket steel technology tire tooth transmission transport transportation vehicle wheel worn-out