have you hit any big potholes or anything lately?
i have 20's and i have a bees willy distance between my tyre and top of strut.
going back a month ago i would turn and hear a knock knock knocking sound. jacked up drvers front and we gave the wheel a spin. heard a slight rubbing sound and discovered it was touching strut in certain spots on tyre. looked at the tyre and noticed lumps in it!.
got a new tyre chucked the wheel on to discover was still rubbing in some spots!
my stub axel must be bent!
just jack up and do these checks and you might discover you have this problem...
get it fix, i ground a bit of the strut back about 1mm - 2mm, until i can get it fixed, and i am changing my struts/suspension gear anyways.
grinding is not advised unless you are going to change it in the near future. getting your stub axel fixed isnt a big job.