As promised, here is the stiffness data for the Velocite Helios frame. Three samples were tested by the factory test machines for deflection in the head tube and bottom bracket areas.
The bottom bracket stiffness is constant across sizes, while the head tube stiffness varies according to size. The heaviest frame, size XL, weighs 1115g with bottom bracket guide, full coating of clear lacquer and uncut ISP mast.
The values below represent averages.
Here are comparative stiffness results for some other frames, as found by Google.
Bottom bracket (N/mm)
Head tube (N/mm)
|Look 595 Ultra||185||120|
|Look 585 Ultra||180||115|
|Storck Fascenario 0.8
|Scott Addict SL||86||–|
|Cannondale Super Six||93||–|
With these results, please keep in mind that I do not know how they were measured and when.