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

The e*thirteen Helix Race 107 BCD Chainring designed for 4-bolt 107 BCD 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*thirteen's cassettes for more overall range and higher top speeds. Made from durable premium 7075 alloy they're 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(R) Crank assembly.Compatible with 4-bolt 107 BCD SRAM(R) cranks and Quarq(R) power meter cranksM4 narrow-wide tooth profile provides Shimano and SRAM 11/12-speed chain compatibility (Including flattop chains) excellent chain retention and reduced wear4.8mm offset (Chainline is determined by SRAM(R) 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 aestheticsDurable 7075-T7 construction for long wear-life stiffness and strength