Praxis eCrank arms for Specialized eBikes with the SL 1.1 motor, which uses a black alloy Praxis M30 spline spindle. Change crank length or move to carbon on an SL 1.1 Levo SL, Kenevo SL, Vado SL or Creo SL.

Highlights

• For the Specialized SL 1.1 motor with the Praxis M30 spline spindle. Praxis says not for SL 1.2
• Carbon (C.R.A.F.T.) or cold-forged alloy left and right arms
• 182mm Q-factor on the SL 1.1 motor, road and MTB versions alike
• Carbon MTB set 350g (165mm), carbon road set 340g (172.5mm), alloy set 485g (Praxis figures)
• Replaceable M30 alloy main bolt with built-in self-extractor, 8mm hex, 50Nm

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 M30 main bolt (50Nm). 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

The options differ in length, arm material and version. Praxis says the road and MTB versions share the same fitment and 182mm Q-factor on the SL 1.1 motor.

Compatibility & fit

• Fits: Specialized eBikes with the SL 1.1 motor and its black alloy Praxis M30 spline spindle. Praxis lists the SL 1.1 versions of the Levo SL, Kenevo SL, Vado SL and Creo SL.
• Not for SL 1.2 motors. Check which SL motor your bike has before ordering.
• Not for Specialized Turbo models with the steel ISIS-spline spindle (Gen 1–3 Levo, Kenevo, Vado, Como: see Praxis Specialized Turbo-ISIS) or Levo 4 (Type 2).
• Q-factor 182mm on the SL 1.1 motor for both road and MTB versions.
• 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.