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If they're not going to do people for front wheel infractions
Sean Yates did actually get DQed for a Hed 3Deep in the National 50 a few years ago.
Although the 3cm rule is defined clearly enough for people not trying to make words have other meanings than their usual ones, it's hard to enforce because it's hard to gather the evidence, and it doesn't even limit use of the superman position, since anybody really keen to get their elbows a long way forwards could just build a frame with an abnormally long top tube. Shortarses can get pretty Super without even having to buy a custom frame.
If you really want to get rid of superman, you have to place some limit on the angle of the upper arm, and then you get into a set of regulations based on measuring not just the bikes but the riders. Not going to happen when it's hard enough to find timekeepers, never mind scrutineers, and there's nothing at stake in CTT events anyway, so I suspect most of us don't actually care very much about being beaten by cheats since a: they would probably beat us even without cheating and b: making a serious effort to catch the cheats would make TTing a PITA for everybody, with no corollary benefit.
lol perhaps eh :D
Nick English tried to get one a better 3cm one through last year, but to be honest until there's a system in place where these things are actually checked then it's just empty rulings isn't it? If they're not going to do people for front wheel infractions (waaay easier to check) then there's no hope for a positional DQ.