192 cm cyclist. On 175 mm cranks.
Have a newish-to-me 2014 Cervelo S5 (61 cm, s/r 630/405). Having some fit issues and pro fitters in Bay Area are booked solid until late April/May. Obtained my measurements (thrice over) via CompetitiveCyclist and have been using the iOS BikeFastFit Elite to try to work on geometries. Everything is way off due to the stock, uncut Cervelo seatpost @ 350 mm (and I'm bouncing in the saddle with extreme toe-down position through the pedal stroke). Based upon my measurements (see below), it looks like I need to cut the seatpost by 60-70 mm. I figure that will help the other measurements fall into place; however, my question is whether cutting that much of the seatpost is an indication that the 61 cm is too big for me (previous bike was an 2007 Cdale Synapse (58 cm, no published s/r). In particular, CompetitiveCyclist spit out a top tube length of 547 - 551mm but the Cervelo is much longer at 596.
Below are the geometries of the S5, my measurements and the recommendations by CompetitiveCyclist (I know they are an approximation and not a replacement for a true bike fit).
Here is the link to video of me on the bike (showing the rocking motion in the saddle):
https://drive.google.com/drive/folde...et?usp=sharing
Do you all think the 61 cm is too big for me?
S5 Geometries
============
Reach: 405.0
Stack: 630.0
Top Tube: 596.0
Head Angle: 73.5
Seat Angle: 73.0
Head Tube: 205.0
Chainstay: 405.0
Front Centre: 618.0
Standover: 813.0
BB Drop: 68.0
Fork Rake: 43.0
Wheel Size: 700c
Tire Clearance: 23 mm
My measurements (cm)
===================
Inseam: 89
Trunk: 71
Forearm: 36
Arm:67
Thigh: 65
Lower Leg: 56
Sternal Notch: 159
Total Height: 192
The Competitive Fit (cm) → deep in drops
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Top tube length: 54.7 - 55.1
Seat tube range c-c: 57.6 - 58.2
Seat tube range c-t: 59.4 - 59.9
Stem Length: 11.6 - 12.2
BB-Saddle Position: 76.3 - 78.3
Saddle-Handlebar: 55.1 - 55.7
Saddle Setback: 8.2 - 8.6
The Eddy Fit (cm) → less saddle to bar drop
====================================
Top tube length: 54.7 - 55.1
Seat tube range c-c: 58.8 - 59.4
Seat tube range c-t: 60.6 - 61.1
Stem Length: 10.5 - 11.1
BB-Saddle Position: 75.5 - 77.5
Saddle-Handlebar: 55.9 - 56.5
Crank @ 0
Crank @ 90
Crank @ 180