I have fitted Michelin Power Pure SC to my Tmax 530, and they are very good. Not quite as good feel as the Dunlops when riding hard, but better in the wet and better all rounder. There is a version to suit the 500, if it is the one with aluminium frame. Doesn't fit the older steel frame Tmax.
Edit. Won't fit a 2005. Oops.
Brad
Tmax, Naughty Kimmy.
Mavis the Beverly, a feisty shunter, sold!