Well, there were other arbitrary changes along the way. I think the wikipedia article deals with it. By the time someone changed it to kg, wasn't even 25lbs any

Well, there were other arbitrary changes along the way. I think the wikipedia article deals with it. By the time someone changed it to kg, wasn't even 25lbs anymore. Who knows who decided it would be 15kg - but that is kind the point of the oddities when change measurement systems.