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As close as possible to the centre of mass of the frame, so that it doesn't make the bike respond in any unexpected or unusual way
It's <1% change in bicycle mass, and we can assume that the rider and/or team will train thoroughly with the ballasted bike before riding the record attempt/championship race.
gbj_tester-
In that case, below the center of mass to provide a stabilizing moment to keep the bike upright when accelerating a big gear at the start of the race (or reduce rider effort required to stabilize the bike).
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It's <1% change in bicycle mass
But yeah, of course this. Real answer: it doesn't matter as it makes no significant difference.
Second real answer: put it wherever the rider expects the benefit will be highest, for placebo effect.
Cupcakes
As close as possible to the centre of mass of the frame, so that it doesn't make the bike respond in any unexpected or unusual way when peeling off the front of the paceline.
Assumption: pursuit = team pursuit; maximize benefit = minimize adverse effects