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Thanks guys @Greenbank it's a RD-5800 short cage with a front chainring of 36/52. I'd like to change as little as possible component wise, so if I can go with a 11/28 I can live with that.
Short cage version of RD-5800 is:-
Maximum low sprocket 23-28T with double chainset Maximum front difference 16T, total capacity 33TMaximum low sprocket of 25T would work.
52-36 = 16T, so front difference is within spec.
(52-36)+(28-11) = 16+17 = 33T, so total capacity is just fine.So, yes, 52/36 and 11-28 is just within spec for the short cage version.
If it's the medium cage version:-
Maximum low sprocket 28-32T with double chainset Maximum front difference 16T, total capacity 37T(52-36)+(32-11) = 16 + 21 = 37T
So you can just squeeze in a 11-32T cassette with a medium (GS) cage version.
Greenbank
@Soul It's a 5800
Thanks guys @Greenbank it's a RD-5800 short cage with a front chainring of 36/52. I'd like to change as little as possible component wise, so if I can go with a 11/28 I can live with that.