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Originally Posted by UKBROOKLYN
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Firstly, the system in the video is using a 2nd generation (2015+) 11spd medium cage rear derailleur. Even the short cage 2nd generation 11spd derailleur is spec.ed for a larger rear sprocket than a 1st generation (32 vs. 29), and the medium cage has more capacity than the cages on 1st generation derailleurs. Also note that in the big-big combination, the derailleur is stretched to its absolute limit. The maximum sprocket size and capacity of a derailleur can be affected by the frame it is mounted on by differences in hanger and chainstay lengths. Its possible this user's had just the right dimensions for it to (barely) work; others may not be as lucky.
With the shorter cage and a geometry designed for a smaller maximum sprocket size, this setup would definitely not work with a 1st generation Campagnolo 11spd derailleur.