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@velocipede65
OK, I've been asked for some very detailed measurements, so all the measurements I can gather are now below:
Basic frame measurements are:
Top tube, horizontal, c to c = a tad over 54cm (looks like 54.2 or so)
Seat tube, c to top = 49cm (so backwards sloping top tube)
Head tube, inc cups = 15cm, exc cups = 12cm
I'm running a 110mm stem, and with the seatpost set at 72.5cm from centre of BB to top of saddle (in line with seat tube) as shown - I'm just over 5'9"
In addition, I've measured reach and stack as best I can using a couple of online guides (best one being here: https://rideonmagazine.com.au/how-to-measure-stack-and-reach/)
I reckon:
the frame reach is around 37.5cm
the frame stack (exc top cup) is around 53cm
bar reach is 48.5cm
bar stack with all those spacers is 62cm
I've just been looking for similar geometry frames on the web and if you look at the Planet X Pro Carbon, my Aurelius seems to fall in between the Small and the Medium (https://www.planetx.co.uk/c/q/bikes/road-bikes/pro-carbon)