Hello,

I am new and I was wondering if anyone can tell me why the cage of my rear derailleur is longer than the others. They said it is a 'long cage'. But why is it long and others in the group have a shorter one.

My rear is a Shimano 105 9-speed and the front used to be a triple 52/42/30 but I changed it to a double 53/39 months ago.

Do I need to buy a short cage? It seems to work fine as is.