So 4700 STI (10 speed) will work with 11 speed rear mech on a 10 speed cassette?
Yup, 4700 have the same cable pull as the rest of the 11 speed groupset.
(I ran an Shimano MTB 11 speed derailleur converted with Shiftmate to 11 speed road cable pull on a Tiagra RS405 10 speed shifter).
@edscoble started
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So 4700 STI (10 speed) will work with 11 speed rear mech on a 10 speed cassette?