Answer: All current e*thirteen chainring designs (Helix, Guidering SL, Guidering UL, and E*spec) are compatible with all* 12s mountain bike chains on the market.

*Exceptions:

1. SRAM® FlatTop™️ chain, including T-Type - See this article. 
2. Campagnolo® Ekar™️ 13-speed chains. Campy's 13 speed chains are too narrow to fit on any current e*thirteen chainrings.