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*thirteen's narrow-wide tooth profile, they ensure enhanced chain retention, reduced wear, and compatibility with Shimano and SRAM chains. Perfectly complementing all Helix Cranks, they're 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*thirteen's 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
