E*thirteen Helix Race Carbon e*spec Cranks

Yes. These cranks are ASTM 5 approved, which is the highest rating for mountain bike components, meaning they are built to withstand the heavy impacts and high loads associated with bike park and aggressive All-Mountain riding.

The Helix Race Carbon e*spec cranks are compatible with a wide range of major motor systems, including Bosch CX Gen4/5, Brose S Mag, Fazua Ride 60, TQ HPR50, Specialized 2.2 & 3.1, and Avinox. Always verify your specific motor interface and spindle type—such as 24mm ISIS, 30mm ETOR, or SRAM DUB—before purchasing.

While the weight savings are noticeable, the primary benefit is the increased stiffness compared to many stock alloy cranks. This results in more efficient power transfer and a more responsive feel when you are pedaling hard through technical terrain.

Depending on the specific configuration and arm length, these cranks weigh between 320g and 357g. This is typically significantly lighter than standard aluminum cranks, helping you shed rotating weight without sacrificing the structural integrity needed for e-MTB use.

No special maintenance is required beyond standard checks. However, like all carbon components, it is important to ensure your pedals are installed with the correct torque and that you use pedal washers to protect the crank arm interface.

E*thirteen backs these cranks with a 5-year warranty. This covers manufacturing defects and structural issues under normal riding conditions, providing peace of mind given the demands of e-mountain biking.