Twinning. Your post worries me on so many levels! Let's hope that one day you don't need to emergency brake to avoid a cat/dog/person/car/truck.
Here is how we calculated some of the stiffness numbers. For example, for torsional stiffness:
Torsional Stiffness Test:
The bike is mounted horizontally and fixed at the rear axle. The head tube is supported in the middle by a cylinder providing a pivot point.
A 1 inch steel bar is inserted into the head tube. The weight (10 kg) is hung 500 mm from the center of the head tube and the deflection is measured 500 mm from the center of the head tube opposite the weight.
The angle of the bar is calculated using the following equation:
θ - tan-1 (δ/500) 180/π
θ = Angle of bar (degrees)
δ = Measured deflection (mm)
The stiffness is expressed in units of N-m/deg and is found by using the equation:
S = 4.91Nm/θ
Some of the numbers of other aero bikes we've tested:
2. Felt AR FRD
3. Scott Foil
4. Specialized Venge
5. Giant Propel
6. Cervelo S5
These numbers have an absolute and relative (STW) value that are compared to other bicycles we've tested during development of bikes like the F-series and the new F FRD. This is why I claim that the AR FRD is as stiff as most road bikes (not just aero road bikes - all) from an absolute stiffness as well as a STW standpoint.
We also measure vertical compliance measured in y-axis deflection at the saddle rail clamp and dozens of other tests such as one-stay, two-stay, fore-aft, fork deflection, BB, HT, etc...
I don't ride the bike up a hill at 1250w, then coast down and grab another brand and do the same and provide my impressions of stiffness.