I've got 3 Harkin Hoisters in my garage for Kayaks. They'd work for bikes as well.
Personally, I like them better than an electrical lift system. No need to plug in, and they appear to be better built, than the Garage Gator which looks a tad cheesy.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.