Mid Drive shifting under throttle only

[dAz63]

I didn't bother to fit the shift sensor to my bike with the bbshd, I just use the left brake cutout switch, left brake is rear so I treat it like a clutch, a light squeeze doesn't move the pads in much, motor cuts out, shift gears while pedaling then release the brake.

If I don't cut the motor power you can hear and feel the crunch crunch crunch as the gears shift.