LZ’s Tech FAQ: Technical FAQ: Switching derailleur cages, brake pads, cranks, and forks – Dear Lennard, I am interested in converting my Ultegra 6870 rear derailleur from a short cage to medium cage. In the parts diagram, it shows that the three differences are the outer plate, inner plate, and plate axle assembly. I have read that it may not be possible to convert the plate axle assembly but would like your advice. Is it possible to convert the plate axle assembly … http://ow.ly/tD6V50gjtsU