Hi All,

Looking to replace a broken rear derailleur on an old road bike I use as a commuter-12 speed Performance Vitesse-late 1980s, early 90s model. Old derailleur (Shimano Exage Sport) recently got destroyed by an errant plastic bag that got caught in my cassette.

I've been reading up some on rear derrailleurs and am trying to find a middle of the road replacement that will be compatible with my bike.

13T-28T, Shimano LightAction SIS Set

I've been looking at the Shimano 105 RD-any advice on what an acceptable replacement would be? Short cage or long cage? I'm looking to stick with Shimano.

Any input would be great appreciated. Thanks!