What Pifko said. http://productinfo.shimano.com/#/com/3.7?types=road&cid=C-453&acid=C-454
Annoyingly, the old Tiagra 4600 had a different cable pull, which means it is compatible with a greater variety of RDs, including the 5700 one you've got...
This may be the wrong place to ask but follows the theme of mix and match -- do 5700 (105 10 spd shifters) work with 4600 (FD and RDs)?
Yes I believe so.
@r_mash started
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What Pifko said.
http://productinfo.shimano.com/#/com/3.7?types=road&cid=C-453&acid=C-454
Annoyingly, the old Tiagra 4600 had a different cable pull, which means it is compatible with a greater variety of RDs, including the 5700 one you've got...