e*13 Helix R Guidering chainring, 38 t, 107 BCD, 4-hole, 11/12-speed, black

The Helix Race 107 BCD chainring is a high-quality upgrade for gravel and road cyclists using 4-bolt 107 BCD cranks such as SRAM XPLR or power meter cranks like Quarq Force or Rival. Take advantage of e*thirteen's cassettes with the widest range by saving 2 teeth or more in chainring size with our smaller 38, 40, and 42T options. This combination supports steeper climbs and faster descents.

The Helix Race 107 BCD chainrings are forged from a wear-resistant 7075 alloy and CNC-optimized to ensure high stiffness, low weight, and good chain retention. Available in black and gray color options, they match e*thirteen's 9-45T and 9-50T cassettes. Like all e*thirteen chainrings, they feature cross-compatible tooth profiles that seamlessly switch between SRAM or Shimano drivetrain systems with 11 and 12 speeds—providing absolute design freedom. The chainline is determined by the SRAM crank arrangement, with 45 mm for standard-width cranks and 47.5 mm for wide cranks.