What can damage a bike? | Bicycle rear derailleur repair and service 

Hello my cyclist subscribers. This video is going to be unusual. Once again, a bike was brought to our bike shop that broke down for an unusual reason. As they say, there's always a first time for everything. I've never seen ordinary grass break a bike's shifter before. Because of the grass that was on the bike's shifter sprocket, the rear derailleur holder attachment was broken. I think it would be very useful for you to know which part will prevent a similar breakdown in the future. I'm going to show you how to fix the bike. This will be a short lesson on how to replace the bracket that secures the rear derailleur to the bike frame. Also, I will show you how to adjust the rear derailleur. I will perform the removal and installation of a bicycle's rear derailleur and fix a deformed derailleur frame.