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if it will take 11-32?
According to Shimano, no RD-5800 will work with 11-32. The RD-5800-SS (short) will do up to 28T but only with a 12T top sprocket, likewise the RD-5800-GS (medium) will do up to 32T but again only with a 12T top. Confusingly, the total capacity of the GS is listed as 37T alongside a maximum front difference of 16T, so they somehow expect you to make 32-12=21 :-) Realistically, the GS will be fine with 52-36/11-32, but the shift into top gear might not be up to Shimano's snappy standards as the B-tension will pull the upper pulley about 0.1mm further away from the sprocket than is ideal.
Shimano have subtly different methods for setting chain length according to how big your bottom sprocket is, and the user manuals are completely fucking hopeless these days, they no longer trust end users with anything more complicated than phoning their LBS, so you have to download the dealer manual.
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gbj_tester
@Bezzin
Unless @Alb knows what comes stock on a Zero 3 in the RD dept and if it will take 11-32?