I had the good fortune to hear Allen Lim talk about working with Floyd Landis and the powertap last week. We questioned him about Landis’s retro-early-90s TT position. This is what we found out:
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Using wind tunnel testing and road testing with the powertap they found this position to be the fastest for him. They actually found testing with the powertap more useful.
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He does lose power in this position, but the better aerodynamics more than make up for it. Also this way he saves energy - useful in a three week tour.
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No the position is not comfortable. He only sits on the tip of the saddle because of UCI regs.