E*thirteen's new direct mount e*spec chainrings use our new M3 narrow-wide tooth profile, which reduces weight without sacrificing chain-retention.

In making the SL and UL chainrings lighter and more beautiful than their predecessors, they adapted a similar design to work with Bosch, Brose, and Shimano motor configurations.


Updated M3 narrow-wide tooth profile eliminates chain noise, and decreases overall system wear.
Lightweight and durable design,
Minimal aesthetics,
Updated M3 tooth profile.


Capacity 11 and 12-Speed Drivetrain Systems
Chainline 52mm or 53mm (Boost chainline)
Profile M3 narrow-wide tooth profile
Compatibility Bosch, Brose, Shimano & Fazua
Material 7050 Aluminum
Mount QuickConnect
Weight 34T: 117g 
36T: 148g 
38T: 174g

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