[hans.olbrecht]

Thank for the message. I'm wondering if you have winter tires?
The iX is a heavy car...
I have just the opposite experience with winter tires.
I almost fell but the car didn't move on the slope.

 

[hans.olbrecht]

I'm missing how the type of tire matters here, as the front were rolling forward dragging the rear. Shouldn't all the wheels be locked?

Handbrake is mostly only the rear wheels.