e*thirteen Helix Guidering – 30t 10/11/12-Speed 52/55mm Flip Flop CL 3/5mm Offset e*thirteen DM Black. Helix Direct Mount rings are designed for use with e*thirteen Helix TRS LG1 and XCX Direct Mount cranks. These rings are compatible with both Shimano and SRAM 12 speed drivetrains.

• e*thirteens Gen 4 narrow-wide tooth profile delivers upgraded chain retention lower system noise and increased wear-life
• Cross-Compatible with SRAM and Shimano 11 and 12 speed chains
• Convenient flip-flop design compatible with both Boost and SuperBoost chainlines (52/55mm)

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