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Oh yeah, fair enough.
Only a big difference over 5 degrees of yaw, which if you believe some people isn't particularly significant for reasonably decent time triallists.
umop3pisdn-
Indeed: http://www.cyclingpowerlab.com/Yaw.aspx
At 48kph (just under 30mph) with a 10kph (~6mph) cross wind - the max Yaw you would see (90deg cross wind) is just under 7degrees.
danb
Who said anything about manufacturer claims? It was a third party that had tested them and were commenting on the tread attachment. I can't remember if they thought it was making it faster or slower.