- Direct Mount chainring for a variety of E-Bike fitment - Updated M3 narrow-wide tooth profile eliminates chain noise, and decreases overall system wear while retaining chain - An alloy outer dust cover helps to prevent contamination - 11/12 speed. Compatible with both Shimano and SRAM 12 speed drivetrains - 53mm chainline to support dropping a chinring size to take advantage of e*thirteen 9t cassette cog