I'm getting back into triathlon as a few years lay off (military service). Put my measurements into competitive cyclists bike fit calculator. Worked perfectly for my road bike fit. Getting a new tri bike soon looking at a Titan flex. I used competitive cyclists tri bike fit. One measurement baffles me. It say I need an effective top tube of 46-48cms. which would put me on a med sized Titanflex at 81degs seat angle. I'm 183 cm or 6ft tall. It makes no sense to me to have a top tube so short. Anyone know where they get the measurement from and has anyone used their measurments to size their bike. Any thoughts great fully accepted.
Full measurements
height 183
trunk 66
forearm 37
thigh 66
lower leg 58
torso 155
Cheers
Wayne