Even gearing down has a limit. Exactly how slowly do you want to go and still try to keep the bike upright? A normal rider would have to put out 500 watts to maintain 4.5 mph on a 30% grade. For how long can you do that? Not to mention the bike handling difficulties. If you get off the straight line of the road, you will be constantly fighting to keep the bike from falling over. What difference does it make what the gearing is that you can push over? Is that the way you want to ride your bike?
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Robert
No matter where I go, here I am...