Praxis EC-4 eCranks – Narrow Fit for Road/Gravel eBikes

The EC-4 crankset is designed for road and gravel eBikes with a narrow Q-factor, compatible with motors that use a steel ISIS spline. These carbon eCranks provide lightweight performance and precise fitment for urban, gravel, and road e-bike setups.

Compatible Motors

• Brose Mag

• Fazua R50

• TQ-HPR50

• Giant E+ System BBSS (Hub Motor)

Not Compatible With

• E-Mountain Bikes

• Specialized Levo, Kenevo, Vomo, or Vado

Specifications

• Set: Left & Right Cranks

• Material: Carbon eCranks

• Main Bolt: Alloy M24 crank bolt with self-extractor

• Installation: 8mm Allen wrench | 50Nm torque

• Weight: 514g (with crank boots)

• Q-Factors:

  • 178mm on Brose Mag motor

  • 163mm on Fazua R50 motor

  • 163mm on TQ-HPR50 motor

Important Notes

• Narrow fit designed specifically for road/gravel eBikes

• Crank boots included for protection

• Installation instructions available via Praxis service guide

The EC-4 eCranks provide a lightweight, stiff, and precise crank solution for narrow-spindle road and gravel e-bike applications.