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Discussion Starter · #1 ·
OK, campy says 2011 11sp and 10sp deraillers are not interchangeable. They do say that all years of 10s levers work with all years of 10s derailleurs. 2011 11s and 10s pulley width is now the same and all the parts from the online pictures look the same shape. There would need to be some minute anchor bolt position you cannot see easily. I know c40 has said that 10s accepts an 11s derailleur reasonably well but 10s need the pinch bolt filing so C40 and Campy seem to agree to a finite difference.

Has anyone seen 2011 10s derailleurs in "real life" and compared with 11s to see a physical geometric difference or measure a difference in pull from 11s?
 
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