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@ewanmac
I'm starting to plan a budget fixed TT bike for next year, but I need a little advice re frame sizing. I already have a 56cm P2 (geared) with this geometry and I want to match my position as closely as possible, but I'm getting a bit confused by geometries.
A tentative first option would be to look for an old frame, but I've got no idea where to start looking. If I simply look for something with a 54-55cm top tube (my P2 has 54.5cm eTT with 78° seat post) would that give me something in roughly the right ball park? I don't know enough about geometries to know how either a traditional road geometry or track geometry would affect the fit? I'm assuming that it's slightly more complicated than matching the top tube because presumably the variations in the length and angle of the seat tube/head tube mean it will be difficult for me to get my saddle and bars into a comfortable position.
Since very few bikes on here are listed with anything more than top tube/seat tube information I was also wondering whether something like the On-One Macinato might be a good solution (at least they provide a geometry chart). If I went for a size medium then the eTT length would be similar to my P2 (54.1cm compared to 54.5cm) but then I'm left with exactly the same set of questions as before.