It is BS. You don't skid in exactly the same place every time you skid unless you are some sort of robot. If you have a good tire that is built to resist skids, you get one skid patch (the full circumference) no matter what gear ratio you ride.
http://www.youtube.com/watch?v=PBKPREQVuu0&feature=g-upl
@1000archangels started
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http://www.youtube.com/watch?v=PBKPREQVuu0&feature=g-upl