Anything more than a 7% grade with a camera in one hand and a recorder in the other makes me uncomfortable (GMR) .

I've gotten up to 25 on a downhill with no hands but I don't do that often, just for testing purposes.

I can ride for miles and miles with no hands. I often record my videos with no hands recording riders behind me. I can ride standing up with no hands and arms out to the sides.

I can even ride a for a bit with no hands on the tandem but Gina doesn't like it.