Origin8 Alloy Classic Chainrings, 144mm, Silver Review Posted by GiantPandaisy July 12, 2018 in Drivetrain Components CNC machined 6061-T6 aluminum construction 144mm 5-Bolt BCD pattern Track or Fixie applications Made in the U.S.A. Origin8 Alloy Classic Chainrings in various sizes Cycling Origin8 Outdoor Recreation Parts & Components Sports & Outdoors