Frey Hunter/ Bafang Ultra- replacement crank arms

[Escoozeh]

I have a Frey Hunter with what I believe are the stock 170mm crank arms on the Bafang Ultra. I'd like to get shorter cranks to reduce pedal stroke.

Anyone know how I could figure out which arms would be compatible? I believe the Ultra uses ISIS style arms? I believe the only other thing I need to pay attention to is Q-factor for clearance. Is this correct?

 

[JCofMN]

I have a Frey Hunter with what I believe are the stock 170mm crank arms on the Bafang Ultra. I'd like to get shorter cranks to reduce pedal stroke.

Anyone know how I could figure out which arms would be compatible? I believe the Ultra uses ISIS style arms? I believe the only other thing I need to pay attention to is Q-factor for clearance. Is this correct?

These will probably work:

Amazon.com : Miranda MIS17 Unisex Adult E Bike Fit Alloy Cranks Delta Style 150mm Black E Bike Cranks 150mm Delta - Black, 150mm : Sports & Outdoors

Amazon.com : Miranda MIS17 Unisex Adult E Bike Fit Alloy Cranks Delta Style 150mm Black E Bike Cranks 150mm Delta - Black, 150mm : Sports & Outdoors

www.amazon.com

I've successfully installed them on an ultra equipped ultra Eagle that also came with the original Bafang arms, so you should have no problem with chainstay clearance.