Originally Posted by
Hondo6
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 was in a hurry and didn't take time to word what I was trying to say correctly. Mostly I just didn't want anyone giving me grief about the ST-4700 not being able to shift an 11 speed rear cassette.
However the ST-4700 rear shifter will... I think, shift most any 10 speed rear cassette when used with a RD-4700 or any 11 speed Shimano road RD with a 10 speed cassette, for the crop of 105, Ultegra and DuraAce line that came out about the time of Tiagra 4700. Whether that's every 11 speed road RD, I'm not certain.
But I might be talking out of my head, so double check.