I know that for the Vigorelli and the model I have, it's a grass track racer and thus is built to take a 700x28c tire easily with clearance to spare. My frame was built to be a 53 but has a higher bottom bracket than my other track frames, again for clearance. I wanted it this way too since it feels a bit larger and more road-like -- I was looking for something comfortable to ride day in and day out and over long distances as well.

The Vigorelli, if you want it, can come with fender mounts free of charge so fender clearance can be achieved.

As for Visitor's, his is fully custom, so he'd be better to answer that. Though he picked a 74.5 angle so that would explain it.