My initial thought was 28c, and indeed I ordered those when I ordered the wheels, but I now read that 28c tyres tend to measure 29/30mm (these are GP 5000 TL), and that from an aerodynamics point of view my 50mm deep rims might be rendered a bit moot if the tyre is wider than the rim.
So is 25c the right choice? It's what I've been running for a few years, and I have no problems with comfort or pinchflats. I tend to run 80ish in the back and 65ish in the front.
I'm a loser who's more interested in going fast than being comfortable, what size should I have?
I know the theory behind wider tyres rolling faster on anything other than glass-smooth surfaces, but then there's the aero side to consider.
What wins, on 50mm deep 27.5mm wide rims - 28c, or 25c?
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