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Really? I've set up a few 5700/Spyre combo's and they've all been pretty tight. Actually helped colleague re-cable his today. Good bite with little lever throw. Just gotta spend time with them.
Can also confirm, Shimano tech rep emphatically says 4700 is different to older 10 speed, something like 3.5/1
Chak
edscoble
Tiagra 4700 AFAIK have different cable pull to the older 10 speed shifters, however the new derailleur are designed to work with a 11-34 cassette, meaning with some tweaking, 11-36 within the realm of possibility.
It's not that you can't ride with the 5700 shifters, you still can get decent braking performance, but with slightly more levers throw than you think.