spaceman, the new Metz has a life expentancy of "less" than the first.
Reason, as time goes by & you spend more time aboard the Rocket, you become more comfortable & confident in your "wrist wickedry" and therefore, the rear wheel tends to see more "torque" than the rubber of the Metz sees "grip" with the asphalt.
Hense, tire spin (not even noticable most of the time), hense, faster wear, hense, happier rider, hense, another Metz. Then the process starts all over again.
Enjoy! I know I do.