I am trying to decide whether to replace my running shoes. There is a slight sign of wear on one of the treads but not major. In have replaced my older Asics that had visibly worn but am not sure these Nikes need replacing now. I am getting some pins and needles at the end of my runs but am having that on either my Nikes (which I prefer to run in) or my newer Asics. Is this a sign to change my shoes? I'm not sure. According to my records I have covered 177 km in them. My old Asics latest 218 km. Am I being overly cautious?