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 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® 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
| Ring Position/Type |
Chain Retaining Single Ring |
| Tooth Count |
40 |
| Drivetrain Speeds |
12 |
| Round or Oval |
Round |
| Chainring BCD |
107 |
| Material |
Aluminum |
| Color |
Black |
| Weight |
74 |
| Defined Color |
Black |
| Teeth |
40T |
