OK to use shorter crank arms on ebike?

[RedRider]

My Haibike 2017 with Yamaha has 4 sensors.
I plan to use smaller tires, from 27.5x3.0 on 40 mm to 2.8 on 30 mm.
My arms are 175 mm, can i go to 165?
I heard that Bosch suggest not to change the length because it messes with a sensor.

 

[RedRider]

Well i got 165 arms and only positive change.

 

[Nurse Ben]

Yes

 

[dfriz]

my buddies Haibike has 160's for Cranks

 

[RedRider]

I was talking with my LBS manager who sells Giant with Yamaha and their training was do not touch, unbolt engine if needed and ship it.
I was wondering about messing with sensors and assist.
I felt no difference, just less strikes.