Echo splined cog (found on pre-2010 Echo, ZOO, Czar, GU, Adamant hubs) is a robust steel CNC machined Echo sprocket compatible with the Echo Spindle system.
Compatible with all Echo hubs with splined interface
and with 3/32" and 1/8" chains. 7mm thick base stops the sprocket from digging into the drive shell.
Note: despite the appearance, this sprocket is not compatible with Shimano HG/UG systems.