The trick question
"My 10-speed cassette is worn, I'd like to upgrade to 11-speed on my 2014 frame, will it work?" Short answer: it depends on 3 elements, and not on the frame.
The 3 real blockers
1. Freehub body
The pivot of the question. An 11-speed Shimano road cassette needs a freehub body 2.5 mm longer than a 10-speed.
2. Rear derailleur
A 10-speed derailleur doesn't have the right cable-pull ratio for 11-speed.
3. Shifters
Same as the derailleur: the ratio differs. A 10-speed shifter will never make 11 gears.
