I was just in the wind tunnel with him last week, and we were determined to get those bars flat, but for whatever reason this just works for him. I have to say that in the last 6 years I've been to like 20 tunnel tests of both pro and amateur athletes, roadies and triathletes, and this is the only time I've ever seen a bar position like this work for anybody. Just like the manager of the wind tunnel said, 'It wouldn't be a wind tunnel test if we didn't discover something that completely went against everything we thought we knew'...
We all had our bars angled up in the late 80's, early 90's, but much of that was because we were also using massive risers under the pads to get the front end high enough to be comfortable. This was a result of putting aero bars onto funny bikes with 24" or 650c front wheesl and tiny head tubes. If you look at Lemond's Kronostrada from the 89 tour or any of the Indurain TT bikes you will see bars at about 30 degrees, but with 2+" of pad risers so the effective arm angle was maybe only 10 degrees or so. I've definitely seen angles between 0 and 10 work for people as it has a way of flattening out the back a bit for some folks, but the Landis position would not seem to work for most people.
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