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@El_Diablo
British Cycling Road Racing and Track endurance rules state you must have your saddle (nose) a minimum of 5cm behind the bottom bracket, otherwise its a disqualification. (It can be measured using a plumb line, but there is a proper gizmo to do it)
The only case that can have different is a "Morph" and that'd need checking.
In most cases the saddle is actaully 5cm behind the bb anyway as its a natural position for most peeps.
In the case of racers its as easy to be compliant on all bikes and then there's no fuss or worry