Belt Drive CDX Front Sprocket, 104BCD, 42t

- Superlight machined aluminum sprocket with CenterTrack guide ridge \n- Available in two standard bolt circle configurations to fit most cranks, with specific version for Shimano Di2 specific chainline offset and tandem specific drivetrains\n- Compatible only with CDX CenterTrack belts\n- Visit http://www.gatescarbondrive.com/ or download the Gates Carbon Drive iPhone app for drivetrain calculations and tension analysis