E-Thirteen Helix R 107 BCD 4-Bolt Chainring - 40t 11/12-Speed 107BCD Black

Discover the precision and durability of the e*thirteen Helix R 107 BCD 4-Bolt Chainring - 40t 11/12-Speed 107BCD Black, engineered for serious Gravel and Road cyclists seeking a reliable upgrade. Designed specifically for 4-bolt 107BCD cranks such as SRAM Red or Force, including those equipped with power meters, this chainring enhances your bike’s performance by offering greater overall gear range and improved top-end speed. Made from premium 7075-T7 aluminum alloy, this chainring is CNC-machined to optimize stiffness while reducing weight, ensuring a responsive and efficient riding experience. Its robust construction delivers exceptional strength and long-lasting wear resistance, making it a trustworthy component for demanding cycling conditions. The 38, 40, and 42-tooth options perfectly complement e*thirteen’s cassettes, allowing riders to fine-tune their gear ratios for optimal cadence and power output. Compatible with both SRAM and Shimano 11 and 12-speed drivetrains, the Helix R features an M4 narrow-wide tooth profile that significantly improves chain retention and reduces wear, even with flattop chains. The 4.8mm offset maintains a precise chainline dictated by the SRAM® crank assembly—45mm for standard cranks and 47.5mm for wide cranks—ensuring smooth and efficient power transfer on every pedal stroke.

• Compatible with 4-bolt 107 BCD SRAM® cranks and Quarq® power meter cranks for seamless integration
• M4 narrow-wide tooth profile guarantees excellent chain compatibility and retention with Shimano and SRAM 11/12-speed drivetrains
• 4.8mm offset maintains optimal chainline as set by SRAM® crank assemblies
• Crafted from high-grade 7075-T7 aluminum and CNC optimized for lightweight strength and a sleek design
• Durable construction ensures long wear life, stiffness, and strength under demanding conditions