Summary: A static deflection test was previously performed on several carbon tubes allowing them to be compared based solely on “stiffness”, or the “spring constant” for each tube.  A link to the discussion can be found here: http://kitelife.com/forum/topic/7329-carbon-tubing-comparison/ Experienced Rev fliers have responded with comments regarding the “reflex”, or response of the carbon tube frame being more important than the “stiffness” or weight of the frame.  Experience