This is my first fixed, but since I have a lifetime of experience with very lightweight bikes and components, such as light tubular wheels, I think I’d go with the PX-10. As well, it’s fitted for a front brake (well, all of these frames are). So I’d use it as a road bike as well as on a track. I think the Lexus (Detroit) track criterion is that you have to be able to ride at a minimum speed. I don’t recall th actual criterion, but I’m sure I have some work to do.

Also important, I have pretty much a full set of the bike’s original headset, bb, and chainset components and fittings. Would need a rear hub, however!

Anyone have a decent 52 cm track frame, surplus to needs?