I believe the top tube is so short to accommodate the reach required for the tri extensions for a TT build. In the end this frame is probably comparable to a 52-53cm in terms of standover etc.
I'm 5 ft 9 with an 85cm (approx) inseam and I have around 2 inches spare standing over the top tube.
£90
Top tube length (actual) ctc: 48cm
Head Tube legnth: 17cm
Seattube c-to-top: 53cm
Chainstay length: 41cm
Some inspiration for a TT build.
I believe the top tube is so short to accommodate the reach required for the tri extensions for a TT build. In the end this frame is probably comparable to a 52-53cm in terms of standover etc.
I'm 5 ft 9 with an 85cm (approx) inseam and I have around 2 inches spare standing over the top tube.