Some XK's have been reported with a wheel judder which gives the impression of unbalanced wheel(s). My 1st XK didn't have this but my new one does (new from June 2001). The technician at the garage tells me that Jag are finally researching this to eventually issue a TSB (Technical Service Bulletin), which is the SOP they use for correcting the fault. When this comes from Jag I will post it on the message board, so all you folks that thought you had wheel problems can get it fixed at last!