Originally Posted by
Iride01
ST-4700 STI is not compatible with the 10 speed FD-5700 front DR.
https://productinfo.shimano.com/down...ty_v029_en.pdf .pdf page #21 or C-455. Same for 3x Tiagra too.
Tiagra 4700 is pretty much compatible with all the 11 speed stuff with the exception of it the STI for the rear.
Not sure about your last statement above. The rear ST-4700 works perfectly to shift Shimano 11-speed road RDs - provided you use the combo to shift a
10-speed cassette. I'm running the ST-4700/RD-R7000/10-speed cassette combo now on one bike; it works flawlessly.
I haven't personally tried the inverse config (using an ST-R7000 rear shifter to shift an RD-4700 over an
11-speed cassette). But my guess is that would work just as well, since the RD-4700 indeed seems to be designed to operate using the 11-speed Shimano road pull ratio.