How much does tire weight matter in a rear tire. I mean I am looking at the Maxxis IT, and the Dunlop 952, and the IT is 15 pounds. Its heavy for a rear tire. I heard one guy had to change his suspension setting for the IT. Circular weight in a tire is a lot diffrent than 3 extra pounds in the gas tank for instance. Has anybody else noticed this diffrence? Let me know if I am thinking to deeply into this.