2007 VStar Classic - 6300 miles (had 3900 when purchased last year). Tire tread looks good and no little lines on the sidewalls indicating rot. I was reading an article on tires and it mentioned how to tell the age....so I checked mine and the last 4 after the DOT are 0406. My interpretation is that the tires were manufactured the 4th week of 2006. If that is true (and I am asking if it is), should the tires be replaced just on the basisi of age? I replacement is called for, what would you suggest by brand and name. Do you really save any money if you mail order them and have a shop install them vs just buying them locally and have them installed?