If it's a rear wheel bearing, it'll usually get louder when one side is weighted, or the other is. i.e. in a turn.
Jeremy Clarkson on Detroit: “God may have created the world in six days, but while he was resting on the seventh, Beelzebub popped up and did this place.”
ST CREW #107 / TEAM DURATEC #93 / D23 Crew #3