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I can't see how knobbies would help on ice, unless you add studs. Maybe you can just use a knife to trim your rubbing parts. I still ride on skinny fast tires when even the pedestrians are in trouble. However, I won't ride a bike over icy ruts that are concealed by powder. That's trike time.
The human-electric hybrid is wonderful for a velomobile. It can be set to make you feel weightless, so you can stay with traffic while pedaling easily most of the time instead of sprinting and resting.
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