have a look at this thread, were members have been talking about the same thing. Althoug its winter tyres, it might help
http://www.antaraownersclub.com/forum/winter-wheels_topic432.html#8872
or
http://www.antaraownersclub.com/forum/newbie-with-wheel-question_topic749.html#8880
http://www.antaraownersclub.com/forum/winter-wheels_topic432.html#8872
or
http://www.antaraownersclub.com/forum/newbie-with-wheel-question_topic749.html#8880