Originally Posted by
bhtooefr
I have had a chain fall off on single-speed chain on an IGH, when putting high torque in 1st gear, but it was on my recumbent trike, and the chain wasn't properly tensioned. I tensioned it, no more falling off.
Of course, if it's a BSO, odds are good that it's not properly tensioned, and odds are good that the rider won't know HOW to properly tension it.
And the odds are still low that a chain will come off while riding or stopping on such a bike; and far higher that the person on such a bike can stop it in an emergency than a brakeless bike ridden by one of
Joey's kids.