Hi there,

New to this but hoping I can get some help. I'm a novice biker who
Recently purchased a used hardrock specialised mountain bike which is
A few years old. On my first go of the bike the dérailleur seemed to just come
Away from the bike and seems to be bent. I want to replace this. I'm aware that there is GS and ss and different makes etc.

As far as I can tell a GS Shimano RD 2400 Claris 8 Speed Rear Dérailleur should
Be compatible. As I don't want to spend a lot and can pick this up for about £18.
Is there any reason this would not be compatible with the bike? If so what would be a better option? All help greatly appreciated.

Thanks in advance
Paul.