The stock blue plastic gear is a bit quieter than the metal gear, but if you ride aggressively at maximum power, at low RPM and high gear in hilly areas, or haul a trailer or heavy load, you may want to consider upgrading to the metal gear. We offer it pre-installed as an upgrade in all of our TSDZ2 Systems as well.
Note: Please allow a good ride or two as a break in period once you install your metal gear, as it smooths out and becomes much quieter once ran under load.
Weight: 5.6 oz