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good to know what the clearance is like
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.
It'll just about clear a 25, I think.
Unlikely to be for sale though!