I test every bike by approaching no hand control. I slowly relax my grip on the bars, feeling for pull, one way or the other. If any pull presents itself, there is a problem with the bike and that warrants investigation. The cause could be any number of things, but certainly at least one thing will be found to be out of whack.

Riding a bicycle, with no hands, is stupid, dangerous and against the law. Riding a bicycle, that pulls one way or the other, is stupid and dangerous but perfectly legal.