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® 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

Ring Position/Type	Chain Retaining Single Ring
Tooth Count	40, 42
Drivetrain Speeds	12
Round or Oval	Round
Chainring BCD	107
Material	Aluminum
Color	Black
Weight	74, 81
Defined Color	Black