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@dbr
So, I'm trying to work out if I can stretch to a Medium in a 586 that's for sale... I'm currently riding a KG176 which has a TT of 535, ST of 535, HT 120. These are all CTC. The HT is 72º and the ST is 74º.
As far as my shonky spirit level measurements, the stack is 524mm and the reach is 391mm on my current LOOK. Those are both to the centre line of the HT where it intersects the top of the TT. and should be taken with a pinch of salt.
I'm running a 100mm stem and an inline seatpost (though not Gastoned, it's almost as far back as it'll go on the rails).
I'm inclined to think the Small is the way to go, but the Medium might fit. I'd greatly appreciate your input before I drop all the dollah.