I've taken all my measurments using the comprehensive 'Fit Calculator' at http://www.competitivecyclist.com. However my suggested measurements for a frame don't match up with the proporitions of real frames.

For example if we look at probably the two main measurements 'Effective Top tube length' and 'Seat Tube centre to Top', the Fit calculator suggests respectively 'aprox' 560mm and 600mm (and greater for a more relaxed fit).

A 600mm Seat tube (c-t) equates to a very large frame, however the 560mm Top Tube length equates to a much smaller frame. For example on the bike I own now 'Dawes Giro' I would have to buy a 53cm frame to get that top tube length. I have their largest frame (58cm) and already find the riding position aggressive and can't imagine going to a smaller frame.

What's going on? Are my body measurements freakish? (see below) or am I missing something?

Thanks to anyone who reads all this and puts in the time to make sense of what I'm saying. I appreciate it!


------------------------------- My measurements
Gender M
Inseam 89.1 cm
Trunk 66 cm
Forearm 35.5 cm
Arm 70 cm
Thigh 63 cm
Lower Leg 57.3 cm
Sternal Notch 53.2 cm
Total Body Height 185 cm
------------------------------- Fit Calculator Output for 'Competitive fit'
Seat tube range c-c 57.7
Seat tube range c-t 59.5 - 60.0
Top tube length 55.9 - 56.3
Stem Length 11.8 - 12.4
BB-Saddle Position 79.3 - 81.3
Saddle-Handlebar 55.8 - 56.4
Saddle Setback 6.8 - 7.2
------------------------------