Not sure why this is downvoted. A normal bike shouldn’t weigh more than 15 kg (some weigh just half of that), so a human at 75% would only weigh 45 kg at most. Maybe people are thinking of e-bikes, which are a lot heavier.
Fair enough, but for a human, let's say weighing 70 kg, to be 75% of the total weight, the bike plus whatever is attached to it would have to be above 23 kg. You only reach such a ratio with extra luggage.
