OK to use shorter crank arms on ebike?

33red

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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.
 
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33red

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Aug 15, 2020
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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.
 
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