ethirteen Helix e*spec 104 BCD Aluminum Chainring

ethirteen Helix e*spec 104 BCD Aluminum Chainring Info

The e*thirteen Helix e*spec 104 BCD Aluminum Chainring is a smart, e-MTB-specific solution for riders who want dependable chain retention, long wear life, and broad drivetrain compatibility—without added weight or cost. Designed for 104 BCD spider-based e-bike cranks, the Helix e*spec brings proven e*thirteen performance to a clean, straightforward package.

Machined from forged CNC 7075 aluminum, the Helix e*spec chainring delivers an ideal balance of stiffness, strength, and durability for high-torque electric mountain bike use. The construction keeps weight low while standing up to the sustained loads and power delivery unique to full-power e-MTB systems.

At the tooth interface, e*thirteen’s latest M4 narrow-wide tooth profile provides excellent chain retention and extended wear life. The profile is designed for broad cross-compatibility, working seamlessly with Shimano, SRAM, and TRP 11- and 12-speed drivetrains, including modern T-Type systems. This makes the Helix e*spec a versatile choice for mixed-component builds and future drivetrain updates.

Available in 32T and 34T sizes, the Helix e*spec pairs well with e*thirteen’s wide-range cassettes and is fully compatible with standard 104 BCD spiders as well as the e*thirteen Turbocharger Spider-Bashguard. Whether replacing a worn ring or building a new e-MTB drivetrain, it offers reliable performance at an accessible price point.

e*thirteen Helix e*spec 104 BCD Chainring Specs at a Glance

• BCD: 104 mm.
• Material: Forged CNC 7075 aluminum.
• Tooth Profile: M4 narrow-wide.
• Sizes: 32T and 34T.
• Drivetrain Compatibility: Shimano, SRAM, and TRP 11/12-speed.

Design Benefits

1. E-MTB-Ready Durability: Built to handle sustained torque and power output.
2. Secure Chain Control: M4 narrow-wide teeth improve retention and reduce drops.
3. Wide Compatibility: Works across multiple drivetrain brands and standards.
4. Excellent Value: Premium materials and performance at an accessible price.

Final Take

The e*thirteen Helix e*spec 104 BCD Aluminum Chainring is a dependable, no-nonsense upgrade for e-MTB riders. With strong materials, modern tooth profiling, and broad compatibility, it delivers consistent performance and long service life for everyday riding and aggressive trail use alike.