Videre non videri
Join Date: Sep 2004
Location: Gothenburg, Sweden
Posts: 3,208
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
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It seems to me that all these fitting methods, even the ones that take your full body measurements, assume that men have an inseam/height ratio of 0.46-0.47. That's likely the reason for the extremely poor fit I got when I built a road bike last year. I'm extremely stretched out, and I suspect it's because I have long legs relative to my height, which means a short torso. And it's really torso length that decides what frame size you need.
My inseam/height ratio is over 0.49 (~88/178 cm). The non-legs part of my body is thus 90 cm, and using a ratio of 0.465, I get a corresponding inseam of ~78 cm, and that makes an inseam-based fit calculator suggest a frame size of around 52-53 cm. Which is the size I now have ordered.