Quote Originally Posted by RoadRaven View Post

6. A non-aero helmet creates four times the drag of a non-aero wheelset. It is therefore better (and cheaper) to spend money on a TT helmet, rather those tri-spokes and a disc.
Just going to take myself to task here... while this statement is pretty accurate, it is only accurate if you wear your TT/aero helmet correctly and position your head so it sits in the most efficient place between your shoulder blades and if you never look sideways or behind you.

If you do move your head alot, or can't get the helmet to sit low between your shoulder blades, then your money is much better spent on aero wheels.