E*thirteen Helix Race e*spec

The Helix Race e*spec is designed specifically for Bosch SX and Gen4 CX motor systems using a direct mount interface. Please verify your motor generation before purchasing, as it is not compatible with other motor brands or mounting standards.

The 53mm chainline is optimized to improve shifting performance and chain retention, especially when using the larger cogs on wide-range cassettes. It helps reduce cross-chaining stress, which can extend the lifespan of your drivetrain components.

Yes, the integrated alloy dust cover acts as a barrier against trail debris, mud, and grit that typically accumulates around the motor interface. By keeping contaminants out of the mounting area, it helps reduce wear on the motor seal and keeps your drivetrain running quieter for longer.

Yes, this chainring is fully compatible with both 11 and 12-speed drivetrain systems. The M3 narrow-wide tooth profile is engineered to work seamlessly with modern chain widths to ensure secure retention without dropping.

A 34-tooth ring is a versatile middle ground for e-MTB setups, offering a good balance between climbing torque and top-end speed. If you frequently tackle extremely steep, technical climbs, you might prefer a smaller ring, while faster, flatter terrain might benefit from a larger size.