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Lightweight and durable Carbon arm sets that are compatible with steel ISIS spline spindle motors from Bosch and Yamaha.

Carbon ISIS spline eCrank optimized/shaped for Bosch/Yamaha motors
BUY THIS IF :You want wanting to change length or upgrade your bike to a Carbon eCrank for the Bosch, Yamaha or Giant motors.
MTN or Road use
See specific motor below.
MOTORBOSCH -With steel ISIS spline spindle (NOT Micro-ISIS)
GIANT SyncDrive Pro -With steel ISIS spline spindle
YAMAHA PW-X -With steel ISIS spline spindle
MATERIALLeft & Right arm set | Carbon Fiber | Rubber protective boots / Adhesive scuff guard included
AVG. WEIGHT375g (165mm w/boots)
Q-FactorAll eBike motors have different width spindles and this directly affects the Qfactor when the crank is installed.
These are the Qfactors when you install this crank on these motors :
Q = 180mm : When installed on Bosch motor
Q = 170mm : When installed on Giant/Yamaha motor
MAIN BOLT8mm AL main crank bolt for Install/Self-Extract | 50Nm torque
Our eCranks with ISIS Spline use our replaceable M24 alloy Main bolt/Self extractor
VIP NOTEMOTORS - Check your Bosch/Yamaha/giant motor spindle type.  These cranks are made for "ISIS" steel spline spindle motors.   They install on Bosch, Yamaha, Giant motors and a few other brand motors with steel ISIS Spindles. 
These cranks do NOT install on  Bosch "Micro-ISIS" or "Square Taper" spindle motors 


Praxis warrants components to be free from defects in materials or workmanship for a period of 2 years after original purchase to the original owner.  However, there are limitations such as normal wear and tear…as “nothing lasts forever” so please read our full Warranty Page.



PROCESSING – Orders placed after 12:00pm M-F are processed/shipped the next business day. Please note we cannot ship to P.O. Boxes or APO/FPO addresses. Also, any orders placed over a weekend or holiday will be processed and shipped the next business day.  We ship with Fed Ex and charges are calculated in your shopping cart at checkout.

We only deliver orders to physical mailing addresses within the United States, and  cannot ship to PO boxes, APO or FPO.

30 DAY / RETURNS – At Praxis, we are a core group of riders that believe you should be completely satisfied with the purchase you have made. Should an item purchased through the Praxis Online Store fail to meet your expectations, we will gladly accept its return within 30 days of original purchase date.  WEB RETURNS