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
• Tooth Count: 28
• Drivetrain Speeds: 11
• Drivetrain Speeds: 12
• Round or Oval: Round
• Offset: 3.5
• Material: Aluminum
• Color: Black
• Weight: 43
• Defined Color: Black
• Direct Mount Type: Direct Mount e*Thirteen