Bike rear derailleur arm issue
Hi,
I am fairly new to biking and have an issue. I recently bought a bike to ride around the city (Trek FX 1 Disc). It has been great so far but now I am having an issue.
While pedaling forward, sometimes the rear derailleur will fold or bend which causes my chain to become very loose and will make a loud vibrating noise. All I have to do is begin pedaling backwards and immediately it will re adjust and everything is fine. This happens very frequently now when I ride my bike and I am unsure how to fix it.
Any help would be greatly appreciated.
Thanks