just ordered one!
Possibly a mistake, RD-5700-GS is only rated to 28T max, you can usually cheat a bit but 32 is probably pushing it too far.
But a medium cage should take a 32t?
GS is medium cage. In 5700 (and others of the same or earlier generation), the longer version just has more total capacity than the SS short cage, not the capability to work with a bigger large sprocket.
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Possibly a mistake, RD-5700-GS is only rated to 28T max, you can usually cheat a bit but 32 is probably pushing it too far.