I recently converted the older 10 speed bikes (09 Tarmac and '11 Tarmac/Contador) to Red 22 which is 11 speed, cable. I needed more gear for hills since I'm a fat ass and suck at weight loss. I purchased 2 med cage Rival derailluers. The 09 had been finicky shifting ever since I converted it to 11 speed. There was always one spot in the cassette that would refuse a downshift and clatter. I could move the spot around with adjustment but not eliminate it. So I decided that I would swap that one first. Turns out I missrouted the cable at the derailluer, that's why it was inconvenient. I had the cable on the wrong side of the fixing bolt! Doh!
now it'll take up to a 32 tooth cassette though.