Alloy eCrank arms for eMTBs whose motor uses the ETOR alloy spindle: the Fazua Ride 60, Mahle M40 and Maxon AIR-S. Use them to change to a shorter crank length or replace worn or damaged arms.

Highlights

  • Type 6 arms for the ETOR alloy spindle, MTB shape
  • Fits Fazua Ride 60, Mahle M40 and Maxon AIR-S per Praxis's fit guide
  • Cold-forged alloy left and right arms
  • 536g for a 165mm set (Praxis figure)
  • Replaceable ETOR alloy main bolt with built-in self-extractor, 8mm hex, 40Nm

Fitting

Fitting eCrank arms is a separate workshop service and isn't included in the price. The Tune workshop can fit them and confirm your motor and spindle first. Praxis specifies a torque wrench with an 8mm hex for the ETOR main bolt (40Nm, lower than the 50Nm used on Praxis's M24 eCranks). The bolt comes pre-installed and doubles as a self-extractor, so the arm comes off with the same 8mm hex. Praxis's manual says to re-check the torque after about the first 100km.

Which Praxis eCrank type fits?

Praxis sorts its eCranks by the motor's spindle and the arm shape. Its fit guide (April 2026) matches them like this:

  • Type 1: older Bosch Gen4 CX (BDU37) and SX (BDU31), Yamaha PW-X, Giant SyncDrive Pro
  • Type 2 (MTB): Bosch Gen5 CX (BDU38) and PX (BDU34), Avinox (DJI) M1/M2/M2S, Qore (Brose) Drive3, Specialized Levo 4
  • Type 3 (MTB): Brose S-Mag, TQ HPR50/HPR60, Fazua Ride 50, Bafang M800, SRAM Powertrain
  • Type 4 (narrow road/gravel): Brose S-Mag, Fazua Ride 50, TQ HPR50/HPR60, Giant E+ BBSS
  • Type 5 (road/gravel): TQ HPR40
  • Type 6 (ETOR alloy spindle): Fazua Ride 60 and Maxon AIR-S (MTB and road/gravel), Mahle M40 (MTB)
  • Specialized Turbo-ISIS: Gen 1–3 Levo, Kenevo, Vado, Como (asymmetric arms)
  • M30/SL1.1: Specialized SL 1.1 motor

Options

Both options are the same alloy MTB Type 6 arm set; only the crank length changes.

Crank LengthArmsWeight (Praxis)
160mmAlloy, Type 6 MTBNot published
165mmAlloy, Type 6 MTB536g

Compatibility & fit

Type 6 arms fit motors with the ETOR alloy spline spindle. Q-factors Praxis quotes for the MTB arms (carbon and alloy alike):

MotorQ-factor
Fazua Ride 60178mm
Mahle M40191mm
Maxon AIR-SNot published
  • ETOR spindle only. Not for Fazua Ride 50 or any ISIS-spline motor (Types 1–4), or TQ HPR40 (Type 5).
  • This is the MTB version. Praxis makes a separate Type 6 road/gravel arm for Fazua Ride 60 and Maxon AIR-S.
  • Left and right arms only. No chainring is included.
  • Unsure what your bike has? Check your motor's crank interface with our workshop before ordering.
Praxis warrants its components to be free from defects in materials or workmanship for two years from the original purchase date, to the original owner with proof of purchase. The warranty does not cover normal wear and tear, products installed incorrectly or damaged by the wrong installation or removal tools, crash, impact or abuse, or any modification. This is in addition to your rights under the Australian Consumer Law, so keep your proof of purchase. For warranty support, return the product to Tune Cycles and we'll manage the claim with Praxis's Australian distributor.
  • Type 6 arms for the ETOR alloy spline spindle
  • For Fazua Ride 60, Mahle M40 and Maxon AIR-S eMTB motors
  • Cold-forged alloy arm set, left and right
  • ETOR alloy main bolt and self-extractor, pre-installed, 40Nm
  • Choice of 160 and 165mm
BrandPraxis
ModelEC-Type 6 (EC-6) ETOR, MTB alloy
UseeMTB
Motor interfaceETOR alloy spline spindle
MotorsFazua Ride 60; Mahle M40; Maxon AIR-S (Praxis fit guide)
MaterialCold-forged alloy
ContentsLeft and right crank arms
Q-factor178mm on Fazua Ride 60; 191mm on Mahle M40
Weight536g (165mm set, Praxis figure)
Main boltETOR alloy main bolt / self-extractor, 8mm hex, 40Nm
Crank Length options160mm, 165mm
SKU DSG-PXEC-6ETOR
Brand Praxis

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