e*thirteen Helix R Chainring - 28t 11/12-Speed 52/55mm Flip Flop CL 3.5mm Offset e*thirteen DM Black. e*thirteen Helix R Direct Mount Chainrings manufactured from durable AL-7075-T6 combine aesthetics and design efficiency. Their flip-flop design accommodates Boost or Super Boost chainlines. With e*thirteens narrow-wide tooth profile they ensure enhanced chain retention reduced wear and compatibility with Shimano and SRAM chains. Perfectly complementing all Helix Cranks theyre backward compatible with e*thirteen TRS LG1 and XCX Race cranks.

Direct Mount design for use with Helix cranks adjustable chainline TRS/LG1 cranks and XCX Race cranks

M4 narrow-wide tooth profile provides Shimano and SRAM 11/12-speed chain compatibility excellent chain retention and reduced wear

Convenient flip-flop design compatible with both Boost and SuperBoost chainlines (52/55mm)

e*thirteens Quick Connect direct mount interface keeps the system secure and creak-free

Forged from premium 7075-T7 aluminum then extensively CNC optimized for light weight and technical aesthetics

Durable 7075-T6 construction for long wear-life stiffness and strength