Originally Posted by
zastolj
Lever throw (cable pull) is the same but the derailleur moves through the same old 10-speed cog spacing (10s cassettes are still the same as before). So a Tiagra system would not shift an 11s cassette. I'm pretty sure , correct me if I'm wrong.
Whoops, you're probably right, it would only work if one were to get a rd change in addition to a wheel change. So not useful in a race.