e*thirteen Helix R 107 BCD 4-Bolt Chainring – 40t 11/12-Speed 107BCD Black

e*thirteen Helix R 107 BCD 4-Bolt Chainring – 40t 11/12-Speed 107BCD Black. The e*thirteen Helix R 107BCD Chainring, designed for 4-bolt 107BCD cranks like SRAM Red or Force, including power-meter-equipped cranks, offers a performance upgrade for Gravel and Road cyclists. The 38, 40, and 42-tooth rings pair perfectly with e*thirteens cassettes for more overall range and higher top speeds. Made from durable, premium 7075 alloy, theyre CNC sculpted for a high stiffness-to-weight ratio. Compatible with both SRAM and Shimano 11- and 12-speed drivetrains. Chainline is set by SRAM Crank assembly.

• Compatible with 4-bolt 107 BCD SRAM cranks and Quarq power meter cranks
• M4 narrow-wide tooth profile provides Shimano and SRAM 11/12-speed chain compatibility (including flattop chains), excellent chain retention, and reduced wear
• 4.8mm offset (Chainline is determined by SRAM Crank assembly: 45mm for normal-width cranks, 47.5mm for wide cranks)
• Forged from premium 7075-T7 aluminum, then extensively CNC optimized for light weight and technical aesthetics
• Durable 7075-T7 construction for long wear-life, stiffness, and strength

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