Unless you're of the die-hard C&V crowd, there's a fair chance you ride on 28s now. I'm on not-too-wide 19mm internal wheels, any my 700x25 tubeless Giant Gavias mount to 27.5mm wide. If I want to actually run 25, I need to buy a 23.
On my CX frame, a 700x28 is the narrowest I've ever run, and none of them mounted to 28 wide-- the Continentals I ran some years ago inflated to almost 31mm wide.
A wider tire is something of a trade-off: you're opting to beat your body up less at the loss of some aerodynamic efficiency. The added comfort is absolutely worth it.
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