Subject: Aggressive Aero Riding Position I have a Cervelo dual and I have recently updated my aero riding position. The Dual has a dual position seat post that allows you to have a 75 degree or 78 degree seatpost angle. Also, it comes stock with about 4-5 centimeters of spacers above the head tube.
I recently update my position by removing the spacers and moving the seat to the forward position. I used Dan Empfield's tri bike fit article to evaluate my position and adjust it to the new position. See his article http://www.slowtwitch.com/mainheadings/techctr/bikefit.html
I connected my camcorder up to my computer, put my bike on my trainer and captured video frames that I could compare to Dan's diagrams. I overlayed lines that let me measure my hip angle, shoulder angle, and knee extension angle. I adjusted these until I had the most aggressive aero position (78 degree seat post angle, 150 degree knee extension, lowest handle bar setting on the dual ) and still keep the proper right angles for my hip and shoulder joints.
I have ridden several hours in this new posture and I am reasonably comfortable with it even though the is a little more pressure on the forward part of my crotch. I have only done a short ride on the road, so I don't know what the performance impact will be yet.
Does anyone have experience with the more aggressive riding postures? How much drag/time/speed is the more aggressive posture worth? And does anyone have any comments on Dan's fitting methodology? Please share your experience. Thanks!
Brittain
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