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code/entities/WheelEntity.cs

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+using Sandbox;
+using Sandbox.Joints;
+
+[Library( "ent_wheel" )]
+public partial class WheelEntity : Prop
+{
+	public RevoluteJoint Joint;
+
+	protected override void OnDestroy()
+	{
+		base.OnDestroy();
+
+		if ( Joint.IsValid )
+		{
+			Joint.Remove();
+		}
+	}
+
+	protected override void UpdatePropData( Model model )
+	{
+		base.UpdatePropData( model );
+
+		Health = -1;
+	}
+}