ethirteen Helix Race e*spec Alloy Cranks

ethirteen Helix Race e*spec Alloy Cranks Info

The Helix Race e*spec Alloy Cranks from ethirteen deliver premium e-MTB performance for riders who want the strength, precision, and confidence of alloy without the cost of carbon. Forged and extensively CNC finished, these cranks are engineered to handle the unique loads of modern e-bikes while offering a refined, purposeful aesthetic that complements high-end builds.

Designed specifically for motor-driven applications, the Helix Race e*spec cranks balance low weight with exceptional impact resistance. Shorter length options improve pedal clearance on low bottom-bracket frames, while narrow offsets preserve a traditional MTB Q-factor feel without sacrificing motor or chainstay clearance. Tested to ethirteen’s demanding E-Enduro standards, these cranks are built for aggressive riding and real-world durability.

Helix Race e*spec Alloy Cranks Specs at a Glance

• Material: Forged and CNC finished aluminum.
• Application: e-MTB crankset for high-torque motor systems.
• Offsets: 21.5mm and 26mm options for ISIS spindle motors.
• Standards: EN17406 Class 5 (E-Enduro rated).
• Hardware: Built-in alloy self-extracting crank bolts.
• Protection: Includes custom crank boots.

Design Benefits

1. E-MTB Strength: Designed and tested to withstand high-torque motor loads and hard impacts.
2. Improved Pedal Clearance: Shorter crank length options reduce pedal strikes on technical terrain.
3. Optimized Q-Factor: Narrow offsets maintain a natural pedal stance while clearing modern motors.
4. Service-Friendly: Self-extracting bolts simplify installation and maintenance.
5. Trail Protection: Included crank boots add confidence for aggressive riding.

Compatibility & Fit Notes

The Helix Race e*spec Alloy Cranks are compatible with a wide range of popular motor systems, including Bosch, Brose S Mag, TQ, Fazua, Yamaha, Avinox, Maxon, SRAM, and Specialized SL 1.1, 2.2, and 3.1. For ISIS spindle motors, 26mm offset cranks are optimized for Bosch CX Gen4 and Gen5 frames, while 21.5mm offset cranks are ideal for Bosch SX, Brose S-Mag, Avinox, TQ HPR50, and Specialized 2.2 and 3.1 systems.

Final Take

The Helix Race e*spec Alloy Cranks are a serious upgrade for e-MTB riders who demand strength, precision, and long-term durability. With refined machining, broad motor compatibility, and enduro-level testing, they offer premium performance and confidence on the most demanding terrain.