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Thanks, good to know! More or less what I expected (or actually more generous than I'd have expected), and yeah, modern bulging aero rims can cause unexpected difficulties, I've had that before. In my experience, this then translates to getting an 'oldschool' rim, 25mm exterior max, without any bulge, and mounting a 700x23c tyre that comes to ~25mm when installed.
SwissChap
As umop says, 25* will go in, but there isn't space for much more. They can be a little tight for rim clearance with these new-fangled wheels which bulge out inboard of the beads, so best to use a flat disc in the back, which is apparently the aero choice too. The fork is just the normal FK26 off of the pre-2013 P3 so there's no problem up front.
*That's 25mm real size, not "25" in tyre makers units which could be anything up to 30mm wide depending on which tyre and rim.