Exactly what I was looking for, thanks for the info. In addition to radial tires I've got Racetech springs with emulators up front and 444's on the rear. Aside from a braced swingarm (Sean is making me one) and frame braces I think cutting 30-40lbs off the bike is probably the last thing I can do for improvement without breaking the bank. I haven't removed my centerstand yet, but I imagine that alone has gotta weigh around 15-20lbs. Exactrep makes a rear fender that allows the removal of the steel fender bracket, which probably weighs close to 5lbs. With a combination of some other minor mods like going to a lithium battery, removing the heat shield and engine plastic, and going with a lighter full exhaust, it seems possible to run under 600lbs with full tank.