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@ewanmac
Er... Yes and no. My middle/iron position is less aggressive than my "all out position". I have the option of lowering my stem/handlebar assembly by about 1.5-2cm if I need to, but I'd only really bother if I cared how fast I went in a 10-25mile TT - which I usually don't. Other than that my setup stays the same. Even for long distance stuff my seat post angle is far more aggressive than either a road bike or a UCI TT position. The nose of my saddle is barely 1cm behind the centre of my BB. I'm not 100% sure of the reasoning behind this but the received wisdom among triathletes is that the steep angle improves your ability to run off the bike.
On my "Race" bike I use the forward seat post position. According to Cervelo's geometry chart this equates to 78 degrees. I don't know exactly how to measure it exactly but I would guess I'm between 78-79 degrees. They aren't great, but the photos show how my bike is set up and my position on the bike.
I bought my road bike on here and no geometry chart exists for it, and as I say I don't know how to measure it accurately. But it is bigger, and slacker than my TT bike. Even with the saddle maximally forward, the nose of the saddle is WAY behind the BB (I did measure a week ago but can't remember now). I've also attached the only side on pic I have to hand (sorry it's shit, it snowed on the lens).
TT Bike:
Position:
(p.s. note that my extensions are marginally too long, so in this pic I am reaching forward to change gear)
Road bike:
